31213430 has 16 divisors (see below), whose sum is σ = 56273184. Its totient is φ = 12465600.

The previous prime is 31213417. The next prime is 31213433. The reversal of 31213430 is 3431213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31213399 and 31213408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5330 + ... + 9530.

It is an arithmetic number, because the mean of its divisors is an integer number (3517074).

Almost surely, 2^31213430 is an apocalyptic number.

31213430 is a deficient number, since it is larger than the sum of its proper divisors (25059754).

31213430 is a wasteful number, since it uses less digits than its factorization.

31213430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31213430 is about 5586.8980660112. The cubic root of 31213430 is about 314.8573470136.

Adding to 31213430 its reverse (3431213), we get a palindrome (34644643).

The spelling of 31213430 in words is "thirty-one million, two hundred thirteen thousand, four hundred thirty".