31000066 has 4 divisors (see below), whose sum is σ = 46500102. Its totient is φ = 15500032.

The previous prime is 31000063. The next prime is 31000087. The reversal of 31000066 is 66000013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 15437041 = 3945^2 + 3929^2 .

It is a super-2 number, since 2×31000066² = 1922008184008712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750015 + ... + 7750018.

Almost surely, 2^31000066 is an apocalyptic number.

31000066 is a deficient number, since it is larger than the sum of its proper divisors (15500036).

31000066 is a wasteful number, since it uses less digits than its factorization.

31000066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15500035.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 31000066 is about 5567.7702898018. The cubic root of 31000066 is about 314.1382881757.

Adding to 31000066 its reverse (66000013), we get a palindrome (97000079).

The spelling of 31000066 in words is "thirty-one million, sixty-six", and thus it is an aban number and an uban number.