906685981 has 8 divisors (see below), whose sum is σ = 922723200. Its totient is φ = 890671200.

The previous prime is 906685961. The next prime is 906685991. The reversal of 906685981 is 189586609.

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 906685981 - 2⁷ = 906685853 is a prime.

It is a super-2 number, since 2×906685981² = 1644158936283864722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906685961) 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, 90156 + ... + 99706.

It is an arithmetic number, because the mean of its divisors is an integer number (115340400).

Almost surely, 2^906685981 is an apocalyptic number.

It is an amenable number.

906685981 is a deficient number, since it is larger than the sum of its proper divisors (16037219).

906685981 is a wasteful number, since it uses less digits than its factorization.

906685981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11219.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 906685981 is about 30111.2268265509. The cubic root of 906685981 is about 967.8743195235.

The spelling of 906685981 in words is "nine hundred six million, six hundred eighty-five thousand, nine hundred eighty-one".