690971081 has 8 divisors (see below), whose sum is σ = 752419200. Its totient is φ = 632031120.

The previous prime is 690971033. The next prime is 690971093. The reversal of 690971081 is 180179096.

It is a happy number.

690971081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 690971081 - 2¹⁰ = 690970057 is a prime.

It is a super-2 number, since 2×690971081² = 954882069556617122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690970081) 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, 626465 + ... + 627566.

It is an arithmetic number, because the mean of its divisors is an integer number (94052400).

Almost surely, 2^690971081 is an apocalyptic number.

It is an amenable number.

690971081 is a deficient number, since it is larger than the sum of its proper divisors (61448119).

690971081 is a wasteful number, since it uses less digits than its factorization.

690971081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254079.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 690971081 is about 26286.3287851309. The cubic root of 690971081 is about 884.0699395433.

The spelling of 690971081 in words is "six hundred ninety million, nine hundred seventy-one thousand, eighty-one".