31213191730 has 32 divisors (see below), whose sum is σ = 64448732160. Its totient is φ = 10661876160.

The previous prime is 31213191721. The next prime is 31213191787. The reversal of 31213191730 is 3719131213.

It is a junction number, because it is equal to n+sod(n) for n = 31213191692 and 31213191701.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 809986 + ... + 847645.

It is an arithmetic number, because the mean of its divisors is an integer number (2014022880).

Almost surely, 2^31213191730 is an apocalyptic number.

31213191730 is an abundant number, since it is smaller than the sum of its proper divisors (33235540430).

31213191730 is a wasteful number, since it uses less digits than its factorization.

31213191730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657914.

The product of its (nonzero) digits is 3402, while the sum is 31.

The spelling of 31213191730 in words is "thirty-one billion, two hundred thirteen million, one hundred ninety-one thousand, seven hundred thirty".