131901281 has 4 divisors (see below), whose sum is σ = 131947200. Its totient is φ = 131855364.

The previous prime is 131901277. The next prime is 131901299. The reversal of 131901281 is 182109131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131901281 - 2² = 131901277 is a prime.

It is a super-2 number, since 2×131901281² = 34795895858881922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131901281.

It is not an unprimeable number, because it can be changed into a prime (131901221) 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, 18341 + ... + 24498.

It is an arithmetic number, because the mean of its divisors is an integer number (32986800).

Almost surely, 2^131901281 is an apocalyptic number.

It is an amenable number.

131901281 is a deficient number, since it is larger than the sum of its proper divisors (45919).

131901281 is an equidigital number, since it uses as much as digits as its factorization.

131901281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45918.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 131901281 is about 11484.8282964962. The cubic root of 131901281 is about 509.0373755271.

The spelling of 131901281 in words is "one hundred thirty-one million, nine hundred one thousand, two hundred eighty-one".