997585231 has 4 divisors (see below), whose sum is σ = 1024547032. Its totient is φ = 970623432.

The previous prime is 997585213. The next prime is 997585249. The reversal of 997585231 is 132585799.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (997585213) and next prime (997585249).

It is a cyclic number.

It is not a de Polignac number, because 997585231 - 2¹³ = 997577039 is a prime.

It is a super-2 number, since 2×997585231² = 1990352586218646722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997580231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13480845 + ... + 13480918.

It is an arithmetic number, because the mean of its divisors is an integer number (256136758).

Almost surely, 2^997585231 is an apocalyptic number.

997585231 is a deficient number, since it is larger than the sum of its proper divisors (26961801).

997585231 is a wasteful number, since it uses less digits than its factorization.

997585231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26961800.

The product of its digits is 680400, while the sum is 49.

The square root of 997585231 is about 31584.5726740129. The cubic root of 997585231 is about 999.1944282284.

The spelling of 997585231 in words is "nine hundred ninety-seven million, five hundred eighty-five thousand, two hundred thirty-one".