997513213 has 2 divisors, whose sum is σ = 997513214. Its totient is φ = 997513212.

The previous prime is 997513201. The next prime is 997513247. The reversal of 997513213 is 312315799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913369284 + 84143929 = 30222^2 + 9173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997513213 is a prime.

It is a super-2 number, since 2×997513213² = 1990065220219166738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997523213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498756606 + 498756607.

It is an arithmetic number, because the mean of its divisors is an integer number (498756607).

Almost surely, 2^997513213 is an apocalyptic number.

It is an amenable number.

997513213 is a deficient number, since it is larger than the sum of its proper divisors (1).

997513213 is an equidigital number, since it uses as much as digits as its factorization.

997513213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 40.

The square root of 997513213 is about 31583.4325715240. The cubic root of 997513213 is about 999.1703829258.

The spelling of 997513213 in words is "nine hundred ninety-seven million, five hundred thirteen thousand, two hundred thirteen".