697963561 has 9 divisors (see below), whose sum is σ = 723655543. Its totient is φ = 673156120.

The previous prime is 697963549. The next prime is 697963627. The reversal of 697963561 is 165369796.

The square root of 697963561 is 26419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 365995161 + 331968400 = 19131^2 + 18220^2 .

It is not a de Polignac number, because 697963561 - 2¹¹ = 697961513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 697963499 and 697963508.

It is not an unprimeable number, because it can be changed into a prime (697963501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 765696 + ... + 766606.

Almost surely, 2^697963561 is an apocalyptic number.

697963561 is the 26419-th square number.

697963561 is the 13210-th centered octagonal number.

It is an amenable number.

697963561 is a deficient number, since it is larger than the sum of its proper divisors (25691982).

697963561 is an frugal number, since it uses more digits than its factorization.

697963561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880 (or 940 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 52.

The cubic root of 697963561 is about 887.0421357372.

The spelling of 697963561 in words is "six hundred ninety-seven million, nine hundred sixty-three thousand, five hundred sixty-one".