697531081 has 8 divisors (see below), whose sum is σ = 751782080. Its totient is φ = 643365072.

The previous prime is 697531069. The next prime is 697531091. The reversal of 697531081 is 180135796.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 697531081 - 2⁵ = 697531049 is a prime.

It is a super-2 number, since 2×697531081² = 973099217922057122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697531001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3651 + ... + 37528.

It is an arithmetic number, because the mean of its divisors is an integer number (93972760).

Almost surely, 2^697531081 is an apocalyptic number.

It is an amenable number.

697531081 is a deficient number, since it is larger than the sum of its proper divisors (54250999).

697531081 is a wasteful number, since it uses less digits than its factorization.

697531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42495.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 697531081 is about 26410.8137133258. The cubic root of 697531081 is about 886.8588848879.

The spelling of 697531081 in words is "six hundred ninety-seven million, five hundred thirty-one thousand, eighty-one".