997802231 has 2 divisors, whose sum is σ = 997802232. Its totient is φ = 997802230.

The previous prime is 997802209. The next prime is 997802251. The reversal of 997802231 is 132208799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997802231 - 2⁶ = 997802167 is a prime.

It is a super-2 number, since 2×997802231² = 1991218584377154722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997802251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498901115 + 498901116.

It is an arithmetic number, because the mean of its divisors is an integer number (498901116).

Almost surely, 2^997802231 is an apocalyptic number.

997802231 is a deficient number, since it is larger than the sum of its proper divisors (1).

997802231 is an equidigital number, since it uses as much as digits as its factorization.

997802231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 997802231 is about 31588.0077086226. The cubic root of 997802231 is about 999.2668729895.

Subtracting from 997802231 its product of nonzero digits (54432), we obtain a palindrome (997747799).

The spelling of 997802231 in words is "nine hundred ninety-seven million, eight hundred two thousand, two hundred thirty-one".