690597081 has 6 divisors (see below), whose sum is σ = 997529130. Its totient is φ = 460398048.

The previous prime is 690597053. The next prime is 690597107. The reversal of 690597081 is 180795096.

690597081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 685601856 + 4995225 = 26184^2 + 2235^2 .

It is not a de Polignac number, because 690597081 - 2¹⁴ = 690580697 is a prime.

It is a super-2 number, since 2×690597081² = 953848656571441122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690597041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38366496 + ... + 38366513.

It is an arithmetic number, because the mean of its divisors is an integer number (166254855).

Almost surely, 2^690597081 is an apocalyptic number.

It is an amenable number.

690597081 is a deficient number, since it is larger than the sum of its proper divisors (306932049).

690597081 is a wasteful number, since it uses less digits than its factorization.

690597081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76733015 (or 76733012 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 690597081 is about 26279.2138581047. The cubic root of 690597081 is about 883.9104047284.

The spelling of 690597081 in words is "six hundred ninety million, five hundred ninety-seven thousand, eighty-one".