997564975 has 24 divisors (see below), whose sum is σ = 1363381488. Its totient is φ = 718003200.

The previous prime is 997564963. The next prime is 997565033. The reversal of 997564975 is 579465799.

It is not a de Polignac number, because 997564975 - 2¹³ = 997556783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7977 + ... + 45373.

It is an arithmetic number, because the mean of its divisors is an integer number (56807562).

Almost surely, 2^997564975 is an apocalyptic number.

997564975 is a deficient number, since it is larger than the sum of its proper divisors (365816513).

997564975 is a wasteful number, since it uses less digits than its factorization.

997564975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37515 (or 37510 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 61.

The square root of 997564975 is about 31584.2520095063. The cubic root of 997564975 is about 999.1876652910.

The spelling of 997564975 in words is "nine hundred ninety-seven million, five hundred sixty-four thousand, nine hundred seventy-five".