31305132 has 18 divisors (see below), whose sum is σ = 79132508. Its totient is φ = 10435032.

The previous prime is 31305083. The next prime is 31305137. The reversal of 31305132 is 23150313.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×31305132² = 1960022579074848, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (31305137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434758 + ... + 434829.

Almost surely, 2^31305132 is an apocalyptic number.

It is an amenable number.

31305132 is an abundant number, since it is smaller than the sum of its proper divisors (47827376).

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

31305132 is a wasteful number, since it uses less digits than its factorization.

31305132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869597 (or 869592 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 31305132 is about 5595.0989267394. The cubic root of 31305132 is about 315.1653855630.

Adding to 31305132 its reverse (23150313), we get a palindrome (54455445).

The spelling of 31305132 in words is "thirty-one million, three hundred five thousand, one hundred thirty-two".