997251810 has 32 divisors (see below), whose sum is σ = 2394496512. Its totient is φ = 265812480.

The previous prime is 997251769. The next prime is 997251811. The reversal of 997251810 is 18152799.

It is a super-2 number, since 2×997251810² = 1989022345096552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997251811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73455 + ... + 85965.

It is an arithmetic number, because the mean of its divisors is an integer number (74828016).

Almost surely, 2^997251810 is an apocalyptic number.

997251810 is an abundant number, since it is smaller than the sum of its proper divisors (1397244702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997251810 is a wasteful number, since it uses less digits than its factorization.

997251810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15178.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 997251810 is about 31579.2940073080. The cubic root of 997251810 is about 999.0830962111.

The spelling of 997251810 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, eight hundred ten".