697685691 has 4 divisors (see below), whose sum is σ = 930247592. Its totient is φ = 465123792.

The previous prime is 697685687. The next prime is 697685701. The reversal of 697685691 is 196586796.

It is a happy number.

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

It is not a de Polignac number, because 697685691 - 2² = 697685687 is a prime.

It is a super-2 number, since 2×697685691² = 973530646852294962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697685671) 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, 116280946 + ... + 116280951.

It is an arithmetic number, because the mean of its divisors is an integer number (232561898).

Almost surely, 2^697685691 is an apocalyptic number.

697685691 is a deficient number, since it is larger than the sum of its proper divisors (232561901).

697685691 is a wasteful number, since it uses less digits than its factorization.

697685691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232561900.

The product of its digits is 4898880, while the sum is 57.

The square root of 697685691 is about 26413.7405719069. The cubic root of 697685691 is about 886.9244050854.

The spelling of 697685691 in words is "six hundred ninety-seven million, six hundred eighty-five thousand, six hundred ninety-one".