31331478049 has 3 divisors (see below), whose sum is σ = 31331655057. Its totient is φ = 31331301042.

The previous prime is 31331478029. The next prime is 31331478127. The reversal of 31331478049 is 94087413313.

The square root of 31331478049 is 177007.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94087413313 = 307 ⋅306473659.

It is not a de Polignac number, because 31331478049 - 2²¹ = 31329380897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31331477996 and 31331478014.

It is not an unprimeable number, because it can be changed into a prime (31331478029) 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, 88504 + ... + 265510.

It is an arithmetic number, because the mean of its divisors is an integer number (10443885019).

Almost surely, 2^31331478049 is an apocalyptic number.

31331478049 is the 177007-th square number.

31331478049 is the 88504-th centered octagonal number.

It is an amenable number.

31331478049 is a deficient number, since it is larger than the sum of its proper divisors (177008).

31331478049 is an frugal number, since it uses more digits than its factorization.

31331478049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354014 (or 177007 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 31331478049 in words is "thirty-one billion, three hundred thirty-one million, four hundred seventy-eight thousand, forty-nine".