997580129 has 24 divisors (see below), whose sum is σ = 1238087232. Its totient is φ = 787026240.

The previous prime is 997580117. The next prime is 997580149. The reversal of 997580129 is 921085799.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-997580129 is a prime.

It is a super-2 number, since 2×997580129² = 1990332227551313282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997580149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497042 + ... + 499044.

It is an arithmetic number, because the mean of its divisors is an integer number (51586968).

Almost surely, 2^997580129 is an apocalyptic number.

It is an amenable number.

997580129 is a deficient number, since it is larger than the sum of its proper divisors (240507103).

997580129 is a wasteful number, since it uses less digits than its factorization.

997580129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 997580129 is about 31584.4919066304. The cubic root of 997580129 is about 999.1927248155.

The spelling of 997580129 in words is "nine hundred ninety-seven million, five hundred eighty thousand, one hundred twenty-nine".