31666906 has 8 divisors (see below), whose sum is σ = 49565664. Its totient is φ = 15145020.

The previous prime is 31666897. The next prime is 31666909. The reversal of 31666906 is 60966613.

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

It is a super-2 number, since 2×31666906² = 2005585871225672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31666909) 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, 344160 + ... + 344251.

It is an arithmetic number, because the mean of its divisors is an integer number (6195708).

Almost surely, 2^31666906 is an apocalyptic number.

31666906 is a deficient number, since it is larger than the sum of its proper divisors (17898758).

31666906 is a wasteful number, since it uses less digits than its factorization.

31666906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688436.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 31666906 is about 5627.3356039959. The cubic root of 31666906 is about 316.3747956394.

The spelling of 31666906 in words is "thirty-one million, six hundred sixty-six thousand, nine hundred six".