13131749 has 2 divisors, whose sum is σ = 13131750. Its totient is φ = 13131748.

The previous prime is 13131743. The next prime is 13131761. The reversal of 13131749 is 94713131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7924225 + 5207524 = 2815^2 + 2282^2 .

It is a cyclic number.

It is not a de Polignac number, because 13131749 - 2⁴ = 13131733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13131743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565874 + 6565875.

It is an arithmetic number, because the mean of its divisors is an integer number (6565875).

Almost surely, 2^13131749 is an apocalyptic number.

It is an amenable number.

13131749 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131749 is an equidigital number, since it uses as much as digits as its factorization.

13131749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 13131749 is about 3623.7755173300. The cubic root of 13131749 is about 235.9251234740.

The spelling of 13131749 in words is "thirteen million, one hundred thirty-one thousand, seven hundred forty-nine".