13131511 has 2 divisors, whose sum is σ = 13131512. Its totient is φ = 13131510.

The previous prime is 13131509. The next prime is 13131523. The reversal of 13131511 is 11513131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13131511 - 2¹ = 13131509 is a prime.

It is a super-2 number, since 2×13131511² = 344873162286242, which contains 22 as substring.

Together with 13131509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13131541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565755 + 6565756.

It is an arithmetic number, because the mean of its divisors is an integer number (6565756).

Almost surely, 2^13131511 is an apocalyptic number.

13131511 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131511 is an equidigital number, since it uses as much as digits as its factorization.

13131511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45, while the sum is 16.

The square root of 13131511 is about 3623.7426785024. The cubic root of 13131511 is about 235.9236981620.

Adding to 13131511 its reverse (11513131), we get a palindrome (24644642).

The spelling of 13131511 in words is "thirteen million, one hundred thirty-one thousand, five hundred eleven".