31155030 has 48 divisors (see below), whose sum is σ = 84009744. Its totient is φ = 8307360.

The previous prime is 31155017. The next prime is 31155049. The reversal of 31155030 is 3055113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31154994 and 31155012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3981 + ... + 8840.

It is an arithmetic number, because the mean of its divisors is an integer number (1750203).

Almost surely, 2^31155030 is an apocalyptic number.

31155030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31155030 is an abundant number, since it is smaller than the sum of its proper divisors (52854714).

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

31155030 is a wasteful number, since it uses less digits than its factorization.

31155030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843 (or 12831 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 31155030 is about 5581.6691052050. The cubic root of 31155030 is about 314.6608594898.

The spelling of 31155030 in words is "thirty-one million, one hundred fifty-five thousand, thirty".