31645130 has 24 divisors (see below), whose sum is σ = 62612676. Its totient is φ = 11506880.

The previous prime is 31645129. The next prime is 31645151. The reversal of 31645130 is 3154613.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29170801 + 2474329 = 5401^2 + 1573^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31645096 and 31645105.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11867 + ... + 14286.

Almost surely, 2^31645130 is an apocalyptic number.

31645130 is a deficient number, since it is larger than the sum of its proper divisors (30967546).

31645130 is a wasteful number, since it uses less digits than its factorization.

31645130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26182 (or 26171 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 31645130 is about 5625.4004301916. The cubic root of 31645130 is about 316.3022597947.

Adding to 31645130 its reverse (3154613), we get a palindrome (34799743).

The spelling of 31645130 in words is "thirty-one million, six hundred forty-five thousand, one hundred thirty".