Search a number
-
+
131121111 = 31124116487
BaseRepresentation
bin1111101000010…
…11111111010111
3100010201122100110
413310023333113
5232031333421
621002214103
73151340202
oct764137727
9303648313
10131121111
1168018260
1237ab4333
132121bb74
14135b2939
15b7a0a76
hex7d0bfd7

131121111 has 16 divisors (see below), whose sum is σ = 191524608. Its totient is φ = 79132800.

The previous prime is 131121031. The next prime is 131121113. The reversal of 131121111 is 111121131.

It is not a de Polignac number, because 131121111 - 221 = 129023959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291 + ... + 16196.

It is an arithmetic number, because the mean of its divisors is an integer number (11970288).

Almost surely, 2131121111 is an apocalyptic number.

131121111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131121111 is a deficient number, since it is larger than the sum of its proper divisors (60403497).

131121111 is a wasteful number, since it uses less digits than its factorization.

131121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16742.

The product of its digits is 6, while the sum is 12.

The square root of 131121111 is about 11450.8126785831. The cubic root of 131121111 is about 508.0317717847.

Adding to 131121111 its reverse (111121131), we get a palindrome (242242242).

It can be divided in two parts, 1311 and 21111, that added together give a palindrome (22422).

The spelling of 131121111 in words is "one hundred thirty-one million, one hundred twenty-one thousand, one hundred eleven".

Divisors: 1 3 11 33 241 723 2651 7953 16487 49461 181357 544071 3973367 11920101 43707037 131121111