13613949 has 6 divisors (see below), whose sum is σ = 19664606. Its totient is φ = 9075960.

The previous prime is 13613947. The next prime is 13613959. The reversal of 13613949 is 94931631.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 783225 = 3582^2 + 885^2 .

It is not a de Polignac number, because 13613949 - 2¹ = 13613947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 756322 + ... + 756339.

Almost surely, 2^13613949 is an apocalyptic number.

It is an amenable number.

13613949 is a deficient number, since it is larger than the sum of its proper divisors (6050657).

13613949 is a wasteful number, since it uses less digits than its factorization.

13613949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512667 (or 1512664 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 13613949 is about 3689.7085250735. The cubic root of 13613949 is about 238.7782178393.

The spelling of 13613949 in words is "thirteen million, six hundred thirteen thousand, nine hundred forty-nine".