131021235 has 12 divisors (see below), whose sum is σ = 227103552. Its totient is φ = 69877968.

The previous prime is 131021167. The next prime is 131021239. The reversal of 131021235 is 532120131.

It is not a de Polignac number, because 131021235 - 2²⁰ = 129972659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131021239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1455747 + ... + 1455836.

It is an arithmetic number, because the mean of its divisors is an integer number (18925296).

Almost surely, 2^131021235 is an apocalyptic number.

131021235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131021235 is a deficient number, since it is larger than the sum of its proper divisors (96082317).

131021235 is a wasteful number, since it uses less digits than its factorization.

131021235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911594 (or 2911591 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 131021235 is about 11446.4507599518. The cubic root of 131021235 is about 507.9027483972.

Adding to 131021235 its reverse (532120131), we get a palindrome (663141366).

The spelling of 131021235 in words is "one hundred thirty-one million, twenty-one thousand, two hundred thirty-five".