129182017491 has 12 divisors (see below), whose sum is σ = 186616677832. Its totient is φ = 86111915616.

The previous prime is 129182017487. The next prime is 129182017499. The reversal of 129182017491 is 194710281921.

129182017491 is a `hidden beast` number, since 1 + 291 + 8 + 201 + 74 + 91 = 666.

It is not a de Polignac number, because 129182017491 - 2² = 129182017487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129182017499) 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, 698506 + ... + 863871.

Almost surely, 2^129182017491 is an apocalyptic number.

129182017491 is a deficient number, since it is larger than the sum of its proper divisors (57434660341).

129182017491 is a wasteful number, since it uses less digits than its factorization.

129182017491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571570 (or 1571567 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The spelling of 129182017491 in words is "one hundred twenty-nine billion, one hundred eighty-two million, seventeen thousand, four hundred ninety-one".