697019409 has 6 divisors (see below), whose sum is σ = 1006805826. Its totient is φ = 464679600.

The previous prime is 697019381. The next prime is 697019413. The reversal of 697019409 is 904910796.

It can be written as a sum of positive squares in only one way, i.e., 629006400 + 68013009 = 25080^2 + 8247^2 .

It is not a de Polignac number, because 697019409 - 2⁸ = 697019153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (697019419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38723292 + ... + 38723309.

It is an arithmetic number, because the mean of its divisors is an integer number (167800971).

Almost surely, 2^697019409 is an apocalyptic number.

It is an amenable number.

697019409 is a deficient number, since it is larger than the sum of its proper divisors (309786417).

697019409 is a wasteful number, since it uses less digits than its factorization.

697019409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77446607 (or 77446604 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 697019409 is about 26401.1251464781. The cubic root of 697019409 is about 886.6419808801.

The spelling of 697019409 in words is "six hundred ninety-seven million, nineteen thousand, four hundred nine".