31213450 has 24 divisors (see below), whose sum is σ = 58394700. Its totient is φ = 12412800.

The previous prime is 31213433. The next prime is 31213477. The reversal of 31213450 is 5431213.

It can be written as a sum of positive squares in 6 ways, for example, as 88209 + 31125241 = 297^2 + 5579^2 .

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, 7326 + ... + 10774.

Almost surely, 2^31213450 is an apocalyptic number.

31213450 is a deficient number, since it is larger than the sum of its proper divisors (27181250).

31213450 is a wasteful number, since it uses less digits than its factorization.

31213450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642 (or 3637 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31213450 is about 5586.8998559129. The cubic root of 31213450 is about 314.8574142618.

Adding to 31213450 its reverse (5431213), we get a palindrome (36644663).

The spelling of 31213450 in words is "thirty-one million, two hundred thirteen thousand, four hundred fifty".