31209130 has 16 divisors (see below), whose sum is σ = 57695400. Its totient is φ = 12146112.

The previous prime is 31209119. The next prime is 31209163. The reversal of 31209130 is 3190213.

It can be written as a sum of positive squares in 4 ways, for example, as 29713401 + 1495729 = 5451^2 + 1223^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31209098 and 31209107.

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, 41805 + ... + 42544.

Almost surely, 2^31209130 is an apocalyptic number.

31209130 is a deficient number, since it is larger than the sum of its proper divisors (26486270).

31209130 is a wasteful number, since it uses less digits than its factorization.

31209130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84393.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 31209130 is about 5586.5132238275. The cubic root of 31209130 is about 314.8428879729.

Adding to 31209130 its reverse (3190213), we get a palindrome (34399343).

The spelling of 31209130 in words is "thirty-one million, two hundred nine thousand, one hundred thirty".