997357311 has 12 divisors (see below), whose sum is σ = 1479563592. Its totient is φ = 646934256.

The previous prime is 997357307. The next prime is 997357321. The reversal of 997357311 is 113753799.

997357311 is a `hidden beast` number, since 9 + 9 + 73 + 573 + 1 + 1 = 666.

It is not a de Polignac number, because 997357311 - 2² = 997357307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997357301) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1497201 + ... + 1497866.

It is an arithmetic number, because the mean of its divisors is an integer number (123296966).

Almost surely, 2^997357311 is an apocalyptic number.

997357311 is a deficient number, since it is larger than the sum of its proper divisors (482206281).

997357311 is a wasteful number, since it uses less digits than its factorization.

997357311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995110 (or 2995107 counting only the distinct ones).

The product of its digits is 178605, while the sum is 45.

The square root of 997357311 is about 31580.9643772954. The cubic root of 997357311 is about 999.1183265470.

The spelling of 997357311 in words is "nine hundred ninety-seven million, three hundred fifty-seven thousand, three hundred eleven".