13131761 has 2 divisors, whose sum is σ = 13131762. Its totient is φ = 13131760.

The previous prime is 13131749. The next prime is 13131787. The reversal of 13131761 is 16713131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10523536 + 2608225 = 3244^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 13131761 - 2²² = 8937457 is a prime.

It is a super-2 number, since 2×13131761² = 344886293922242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13131791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565880 + 6565881.

It is an arithmetic number, because the mean of its divisors is an integer number (6565881).

Almost surely, 2^13131761 is an apocalyptic number.

It is an amenable number.

13131761 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131761 is an equidigital number, since it uses as much as digits as its factorization.

13131761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 23.

The square root of 13131761 is about 3623.7771730613. Note that the first 3 decimals coincide. The cubic root of 13131761 is about 235.9251953380.

Adding to 13131761 its reverse (16713131), we get a palindrome (29844892).

The spelling of 13131761 in words is "thirteen million, one hundred thirty-one thousand, seven hundred sixty-one".