31574091481 has 3 divisors (see below), whose sum is σ = 31574269173. Its totient is φ = 31573913790.

The previous prime is 31574091463. The next prime is 31574091509. The reversal of 31574091481 is 18419047513.

It is a happy number.

The square root of 31574091481 is 177691.

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: 18419047513 = 31 ⋅594162823.

It is not a de Polignac number, because 31574091481 - 2⁹ = 31574090969 is a prime.

It is a super-2 number, since 2×31574091481² (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 (31574091421) 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, 88846 + ... + 266536.

It is an arithmetic number, because the mean of its divisors is an integer number (10524756391).

Almost surely, 2^31574091481 is an apocalyptic number.

31574091481 is the 177691-st square number.

31574091481 is the 88846-th centered octagonal number.

It is an amenable number.

31574091481 is a deficient number, since it is larger than the sum of its proper divisors (177692).

31574091481 is an frugal number, since it uses more digits than its factorization.

31574091481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355382 (or 177691 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 31574091481 in words is "thirty-one billion, five hundred seventy-four million, ninety-one thousand, four hundred eighty-one".