697790881 has 4 divisors (see below), whose sum is σ = 716650132. Its totient is φ = 678931632.

The previous prime is 697790851. The next prime is 697790893. The reversal of 697790881 is 188097796.

697790881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 496576656 + 201214225 = 22284^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 697790881 - 2²¹ = 695693729 is a prime.

It is a super-2 number, since 2×697790881² = 973824227213512322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697790801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9429570 + ... + 9429643.

It is an arithmetic number, because the mean of its divisors is an integer number (179162533).

Almost surely, 2^697790881 is an apocalyptic number.

It is an amenable number.

697790881 is a deficient number, since it is larger than the sum of its proper divisors (18859251).

697790881 is a wasteful number, since it uses less digits than its factorization.

697790881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18859250.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 697790881 is about 26415.7316953364. The cubic root of 697790881 is about 886.9689766793.

The spelling of 697790881 in words is "six hundred ninety-seven million, seven hundred ninety thousand, eight hundred eighty-one".