31913321449 has 3 divisors (see below), whose sum is σ = 31913500093. Its totient is φ = 31913142806.

The previous prime is 31913321441. The next prime is 31913321501. The reversal of 31913321449 is 94412331913.

The square root of 31913321449 is 178643.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 31913321449 - 2³ = 31913321441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31913321441) 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, 89322 + ... + 267964.

Almost surely, 2^31913321449 is an apocalyptic number.

31913321449 is the 178643-rd square number.

31913321449 is the 89322-nd centered octagonal number.

It is an amenable number.

31913321449 is a deficient number, since it is larger than the sum of its proper divisors (178644).

31913321449 is an frugal number, since it uses more digits than its factorization.

31913321449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357286 (or 178643 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The spelling of 31913321449 in words is "thirty-one billion, nine hundred thirteen million, three hundred twenty-one thousand, four hundred forty-nine".