31000030 has 16 divisors (see below), whose sum is σ = 55956384. Its totient is φ = 12365280.

The previous prime is 31000003. The next prime is 31000063. The reversal of 31000030 is 3000013.

It is a happy number.

It is a super-2 number, since 2×31000030² = 1922003720001800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30999977 and 31000022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (3497274).

Almost surely, 2^31000030 is an apocalyptic number.

31000030 is a deficient number, since it is larger than the sum of its proper divisors (24956354).

31000030 is a wasteful number, since it uses less digits than its factorization.

31000030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691.

The product of its (nonzero) digits is 9, while the sum is 7.

The square root of 31000030 is about 5567.7670569089. The cubic root of 31000030 is about 314.1381665740.

Adding to 31000030 its reverse (3000013), we get a palindrome (34000043).

The spelling of 31000030 in words is "thirty-one million, thirty", and thus it is an aban number and an uban number.