31134420 has 36 divisors (see below), whose sum is σ = 94441620. Its totient is φ = 8302464.

The previous prime is 31134413. The next prime is 31134443. The reversal of 31134420 is 2443113.

It can be written as a sum of positive squares in 2 ways, for example, as 4384836 + 26749584 = 2094^2 + 5172^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 31134393 and 31134402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86305 + ... + 86664.

Almost surely, 2^31134420 is an apocalyptic number.

31134420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31134420 is an abundant number, since it is smaller than the sum of its proper divisors (63307200).

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

31134420 is a wasteful number, since it uses less digits than its factorization.

31134420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172984 (or 172979 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31134420 is about 5579.8225778245. The cubic root of 31134420 is about 314.5914582739.

Adding to 31134420 its reverse (2443113), we get a palindrome (33577533).

It can be divided in two parts, 311344 and 20, that added together give a square (311364 = 558²).

The spelling of 31134420 in words is "thirty-one million, one hundred thirty-four thousand, four hundred twenty".