131231245 has 16 divisors (see below), whose sum is σ = 168860160. Its totient is φ = 97553664.

The previous prime is 131231237. The next prime is 131231257. The reversal of 131231245 is 542132131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131231245 - 2³ = 131231237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3057 + ... + 16486.

It is an arithmetic number, because the mean of its divisors is an integer number (10553760).

Almost surely, 2^131231245 is an apocalyptic number.

It is an amenable number.

131231245 is a deficient number, since it is larger than the sum of its proper divisors (37628915).

131231245 is a wasteful number, since it uses less digits than its factorization.

131231245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19644.

The product of its digits is 720, while the sum is 22.

The square root of 131231245 is about 11455.6206728400. The cubic root of 131231245 is about 508.1739708878.

Adding to 131231245 its reverse (542132131), we get a palindrome (673363376).

The spelling of 131231245 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred forty-five".