697499389 has 2 divisors, whose sum is σ = 697499390. Its totient is φ = 697499388.

The previous prime is 697499377. The next prime is 697499441. The reversal of 697499389 is 983994796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691164100 + 6335289 = 26290^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 697499389 - 2⁷ = 697499261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 697499389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697499189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348749694 + 348749695.

It is an arithmetic number, because the mean of its divisors is an integer number (348749695).

Almost surely, 2^697499389 is an apocalyptic number.

It is an amenable number.

697499389 is a deficient number, since it is larger than the sum of its proper divisors (1).

697499389 is an equidigital number, since it uses as much as digits as its factorization.

697499389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 64.

The square root of 697499389 is about 26410.2137249966. The cubic root of 697499389 is about 886.8454533442.

The spelling of 697499389 in words is "six hundred ninety-seven million, four hundred ninety-nine thousand, three hundred eighty-nine".