997126231 has 2 divisors, whose sum is σ = 997126232. Its totient is φ = 997126230.

The previous prime is 997126219. The next prime is 997126267. The reversal of 997126231 is 132621799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997126231 - 2¹⁵ = 997093463 is a prime.

It is a super-2 number, since 2×997126231² = 1988521441096530722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997126271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498563115 + 498563116.

It is an arithmetic number, because the mean of its divisors is an integer number (498563116).

Almost surely, 2^997126231 is an apocalyptic number.

997126231 is a deficient number, since it is larger than the sum of its proper divisors (1).

997126231 is an equidigital number, since it uses as much as digits as its factorization.

997126231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 997126231 is about 31577.3056323683. The cubic root of 997126231 is about 999.0411579157.

The spelling of 997126231 in words is "nine hundred ninety-seven million, one hundred twenty-six thousand, two hundred thirty-one".