31120030 has 16 divisors (see below), whose sum is σ = 59311440. Its totient is φ = 11715712.

The previous prime is 31120027. The next prime is 31120031. The reversal of 31120030 is 3002113.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 31119989 and 31120016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120031) 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, 91360 + ... + 91699.

It is an arithmetic number, because the mean of its divisors is an integer number (3706965).

Almost surely, 2^31120030 is an apocalyptic number.

31120030 is a deficient number, since it is larger than the sum of its proper divisors (28191410).

31120030 is a wasteful number, since it uses less digits than its factorization.

31120030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183083.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 31120030 is about 5578.5329612722. The cubic root of 31120030 is about 314.5429838556.

Adding to 31120030 its reverse (3002113), we get a palindrome (34122143).

The spelling of 31120030 in words is "thirty-one million, one hundred twenty thousand, thirty".