31123230 has 16 divisors (see below), whose sum is σ = 74695824. Its totient is φ = 8299520.

The previous prime is 31123229. The next prime is 31123241. The reversal of 31123230 is 3232113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

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, 518691 + ... + 518750.

It is an arithmetic number, because the mean of its divisors is an integer number (4668489).

Almost surely, 2^31123230 is an apocalyptic number.

31123230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31123230 is an abundant number, since it is smaller than the sum of its proper divisors (43572594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31123230 is a wasteful number, since it uses less digits than its factorization.

31123230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037451.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31123230 is about 5578.8197676570. The cubic root of 31123230 is about 314.5537647262.

Adding to 31123230 its reverse (3232113), we get a palindrome (34355343).

The spelling of 31123230 in words is "thirty-one million, one hundred twenty-three thousand, two hundred thirty".