997201913 has 2 divisors, whose sum is σ = 997201914. Its totient is φ = 997201912.

The previous prime is 997201903. The next prime is 997201921. The reversal of 997201913 is 319102799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 926776249 + 70425664 = 30443^2 + 8392^2 .

It is a cyclic number.

It is not a de Polignac number, because 997201913 - 2¹⁴ = 997185529 is a prime.

It is not a weakly prime, because it can be changed into another prime (997201903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498600956 + 498600957.

It is an arithmetic number, because the mean of its divisors is an integer number (498600957).

Almost surely, 2^997201913 is an apocalyptic number.

It is an amenable number.

997201913 is a deficient number, since it is larger than the sum of its proper divisors (1).

997201913 is an equidigital number, since it uses as much as digits as its factorization.

997201913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 997201913 is about 31578.5039702643. The cubic root of 997201913 is about 999.0664330573.

The spelling of 997201913 in words is "nine hundred ninety-seven million, two hundred one thousand, nine hundred thirteen".