997090257 has 16 divisors (see below), whose sum is σ = 1347655232. Its totient is φ = 655672320.

The previous prime is 997090249. The next prime is 997090261. The reversal of 997090257 is 752090799.

It is not a de Polignac number, because 997090257 - 2³ = 997090249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997090207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83757 + ... + 94917.

It is an arithmetic number, because the mean of its divisors is an integer number (84228452).

Almost surely, 2^997090257 is an apocalyptic number.

997090257 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

997090257 is a deficient number, since it is larger than the sum of its proper divisors (350564975).

997090257 is a wasteful number, since it uses less digits than its factorization.

997090257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568.

The product of its (nonzero) digits is 357210, while the sum is 48.

The square root of 997090257 is about 31576.7360092838. The cubic root of 997090257 is about 999.0291434092.

The spelling of 997090257 in words is "nine hundred ninety-seven million, ninety thousand, two hundred fifty-seven".