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30131 = 291039
BaseRepresentation
bin111010110110011
31112022222
413112303
51431011
6351255
7153563
oct72663
945288
1030131
1120702
121552b
131093a
158ddb
hex75b3

30131 has 4 divisors (see below), whose sum is σ = 31200. Its totient is φ = 29064.

The previous prime is 30119. The next prime is 30133. The reversal of 30131 is 13103.

30131 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-30131 is a prime.

It is a super-2 number, since 2×301312 = 1815754322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491 + ... + 548.

It is an arithmetic number, because the mean of its divisors is an integer number (7800).

230131 is an apocalyptic number.

30131 is a deficient number, since it is larger than the sum of its proper divisors (1069).

30131 is a wasteful number, since it uses less digits than its factorization.

30131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its (nonzero) digits is 9, while the sum is 8.

The square root of 30131 is about 173.5828332526. The cubic root of 30131 is about 31.1174868830.

Adding to 30131 its reverse (13103), we get a palindrome (43234).

It can be divided in two parts, 30 and 131, that added together give a palindrome (161).

The spelling of 30131 in words is "thirty thousand, one hundred thirty-one".

Divisors: 1 29 1039 30131