2531475105721 has 9 divisors (see below), whose sum is σ = 2535997002861. Its totient is φ = 2526961265664.

The previous prime is 2531475105697. The next prime is 2531475105829. The reversal of 2531475105721 is 1275015741352.

The square root of 2531475105721 is 1591061.

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

It can be written as a sum of positive squares in 4 ways, for example, as 556607015721 + 1974868090000 = 746061^2 + 1405300^2 .

It is not a de Polignac number, because 2531475105721 - 2²¹ = 2531473008569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531475105121) 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, 1223524875 + ... + 1223526943.

Almost surely, 2^{2531475105721} is an apocalyptic number.

2531475105721 is the 1591061-st square number.

2531475105721 is the 795531-st centered octagonal number.

It is an amenable number.

2531475105721 is a deficient number, since it is larger than the sum of its proper divisors (4521897140).

2531475105721 is an frugal number, since it uses more digits than its factorization.

2531475105721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676 (or 2838 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 2531475105721 in words is "two trillion, five hundred thirty-one billion, four hundred seventy-five million, one hundred five thousand, seven hundred twenty-one".