997213493 has 2 divisors, whose sum is σ = 997213494. Its totient is φ = 997213492.

The previous prime is 997213471. The next prime is 997213561. The reversal of 997213493 is 394312799.

It is a happy number.

997213493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 832784164 + 164429329 = 28858^2 + 12823^2 .

It is an emirp because it is prime and its reverse (394312799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997213493 is a prime.

It is a super-2 number, since 2×997213493² = 1988869501242522098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997213433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498606746 + 498606747.

It is an arithmetic number, because the mean of its divisors is an integer number (498606747).

Almost surely, 2^997213493 is an apocalyptic number.

It is an amenable number.

997213493 is a deficient number, since it is larger than the sum of its proper divisors (1).

997213493 is an equidigital number, since it uses as much as digits as its factorization.

997213493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 47.

The square root of 997213493 is about 31578.6873223065. The cubic root of 997213493 is about 999.0703002596.

The spelling of 997213493 in words is "nine hundred ninety-seven million, two hundred thirteen thousand, four hundred ninety-three".