131691412 has 6 divisors (see below), whose sum is σ = 230459978. Its totient is φ = 65845704.

The previous prime is 131691397. The next prime is 131691419. The reversal of 131691412 is 214196131.

It can be written as a sum of positive squares in only one way, i.e., 120428676 + 11262736 = 10974^2 + 3356^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131691419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16461423 + ... + 16461430.

Almost surely, 2^131691412 is an apocalyptic number.

It is an amenable number.

131691412 is a deficient number, since it is larger than the sum of its proper divisors (98768566).

131691412 is a wasteful number, since it uses less digits than its factorization.

131691412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32922857 (or 32922855 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 131691412 is about 11475.6878660933. The cubic root of 131691412 is about 508.7672546352.

The spelling of 131691412 in words is "one hundred thirty-one million, six hundred ninety-one thousand, four hundred twelve".