12491956 has 6 divisors (see below), whose sum is σ = 21860930. Its totient is φ = 6245976.

The previous prime is 12491939. The next prime is 12491971. The reversal of 12491956 is 65919421.

It can be written as a sum of positive squares in only one way, i.e., 8820900 + 3671056 = 2970^2 + 1916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561491 + ... + 1561498.

Almost surely, 2^12491956 is an apocalyptic number.

It is an amenable number.

12491956 is a deficient number, since it is larger than the sum of its proper divisors (9368974).

12491956 is a wasteful number, since it uses less digits than its factorization.

12491956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122993 (or 3122991 counting only the distinct ones).

The product of its digits is 19440, while the sum is 37.

The square root of 12491956 is about 3534.3961294682. The cubic root of 12491956 is about 232.0296484107.

The spelling of 12491956 in words is "twelve million, four hundred ninety-one thousand, nine hundred fifty-six".