31527198481 has 9 divisors (see below), whose sum is σ = 31679745019. Its totient is φ = 31375385536.

The previous prime is 31527198473. The next prime is 31527198511. The reversal of 31527198481 is 18489172513.

The square root of 31527198481 is 177559.

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., 12808580625 + 18718617856 = 113175^2 + 136816^2 .

It is not a de Polignac number, because 31527198481 - 2³ = 31527198473 is a prime.

It is a super-2 number, since 2×31527198481² (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 (31527198401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62678076 + ... + 62678578.

Almost surely, 2^31527198481 is an apocalyptic number.

31527198481 is the 177559-th square number.

31527198481 is the 88780-th centered octagonal number.

It is an amenable number.

31527198481 is a deficient number, since it is larger than the sum of its proper divisors (152546538).

31527198481 is an frugal number, since it uses more digits than its factorization.

31527198481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712 (or 856 counting only the distinct ones).

The product of its digits is 483840, while the sum is 49.

Multiplying 31527198481 by its sum of digits (49), we get a square (1544832725569 = 1242913²).

The spelling of 31527198481 in words is "thirty-one billion, five hundred twenty-seven million, one hundred ninety-eight thousand, four hundred eighty-one".