31685213197444 has 9 divisors (see below), whose sum is σ = 55449142796901. Its totient is φ = 15842600969760.

The previous prime is 31685213197441. The next prime is 31685213197499. The reversal of 31685213197444 is 44479131258613.

The square root of 31685213197444 is 5628962.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2249814003844 + 29435399193600 = 1499938^2 + 5425440^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31685213197441) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9850684 + ... + 12665164.

Almost surely, 2^{31685213197444} is an apocalyptic number.

31685213197444 is the 5628962-nd square number.

It is an amenable number.

31685213197444 is a deficient number, since it is larger than the sum of its proper divisors (23763929599457).

31685213197444 is an frugal number, since it uses more digits than its factorization.

31685213197444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628966 (or 2814483 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 58.

The spelling of 31685213197444 in words is "thirty-one trillion, six hundred eighty-five billion, two hundred thirteen million, one hundred ninety-seven thousand, four hundred forty-four".