31140136 has 16 divisors (see below), whose sum is σ = 58454100. Its totient is φ = 15552384.

The previous prime is 31140077. The next prime is 31140157. The reversal of 31140136 is 63104113.

It can be written as a sum of positive squares in 2 ways, for example, as 29095236 + 2044900 = 5394^2 + 1430^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8100 + ... + 11308.

Almost surely, 2^31140136 is an apocalyptic number.

It is an amenable number.

31140136 is a deficient number, since it is larger than the sum of its proper divisors (27313964).

31140136 is a wasteful number, since it uses less digits than its factorization.

31140136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428 (or 4424 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31140136 is about 5580.3347569837. The cubic root of 31140136 is about 314.6107091517.

Adding to 31140136 its reverse (63104113), we get a palindrome (94244249).

The spelling of 31140136 in words is "thirty-one million, one hundred forty thousand, one hundred thirty-six".