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131121443 = 385334031
BaseRepresentation
bin1111101000011…
…00000100100011
3100010201122210202
413310030010203
5232031341233
621002215415
73151341155
oct764140443
9303648722
10131121443
1168018532
1237ab456b
132121c06b
14135b2ad5
15b7a0be8
hex7d0c123

131121443 has 4 divisors (see below), whose sum is σ = 131159328. Its totient is φ = 131083560.

The previous prime is 131121439. The next prime is 131121457. The reversal of 131121443 is 344121131.

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

It is a cyclic number.

It is not a de Polignac number, because 131121443 - 22 = 131121439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131121433) 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, 13163 + ... + 20868.

It is an arithmetic number, because the mean of its divisors is an integer number (32789832).

Almost surely, 2131121443 is an apocalyptic number.

131121443 is a deficient number, since it is larger than the sum of its proper divisors (37885).

131121443 is an equidigital number, since it uses as much as digits as its factorization.

131121443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37884.

The product of its digits is 288, while the sum is 20.

The square root of 131121443 is about 11450.8271753616. The cubic root of 131121443 is about 508.0322005649.

Adding to 131121443 its reverse (344121131), we get a palindrome (475242574).

The spelling of 131121443 in words is "one hundred thirty-one million, one hundred twenty-one thousand, four hundred forty-three".

Divisors: 1 3853 34031 131121443