31930473481 has 3 divisors (see below), whose sum is σ = 31930652173. Its totient is φ = 31930294790.

The previous prime is 31930473467. The next prime is 31930473569. The reversal of 31930473481 is 18437403913.

The square root of 31930473481 is 178691.

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 31930473481 - 2²¹ = 31928376329 is a prime.

It is a super-2 number, since 2×31930473481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31930473581) 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, 89346 + ... + 268036.

Almost surely, 2^31930473481 is an apocalyptic number.

31930473481 is the 178691-st square number.

31930473481 is the 89346-th centered octagonal number.

It is an amenable number.

31930473481 is a deficient number, since it is larger than the sum of its proper divisors (178692).

31930473481 is an frugal number, since it uses more digits than its factorization.

31930473481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357382 (or 178691 counting only the distinct ones).

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

The spelling of 31930473481 in words is "thirty-one billion, nine hundred thirty million, four hundred seventy-three thousand, four hundred eighty-one".