13172531 has 2 divisors, whose sum is σ = 13172532. Its totient is φ = 13172530.

The previous prime is 13172527. The next prime is 13172543. The reversal of 13172531 is 13527131.

It is a weak prime.

It is an emirp because it is prime and its reverse (13527131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13172531 - 2² = 13172527 is a prime.

It is a super-2 number, since 2×13172531² = 347031145891922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 13172497 and 13172506.

It is not a weakly prime, because it can be changed into another prime (13172581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6586265 + 6586266.

It is an arithmetic number, because the mean of its divisors is an integer number (6586266).

Almost surely, 2^13172531 is an apocalyptic number.

13172531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13172531 is an equidigital number, since it uses as much as digits as its factorization.

13172531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 23.

The square root of 13172531 is about 3629.3981594749. The cubic root of 13172531 is about 236.1691010114.

Adding to 13172531 its reverse (13527131), we get a palindrome (26699662).

The spelling of 13172531 in words is "thirteen million, one hundred seventy-two thousand, five hundred thirty-one".