13539949 has 2 divisors, whose sum is σ = 13539950. Its totient is φ = 13539948.

The previous prime is 13539943. The next prime is 13539961. The reversal of 13539949 is 94993531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8743849 + 4796100 = 2957^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 13539949 - 2³ = 13539941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13539941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769974 + 6769975.

It is an arithmetic number, because the mean of its divisors is an integer number (6769975).

Almost surely, 2^13539949 is an apocalyptic number.

It is an amenable number.

13539949 is a deficient number, since it is larger than the sum of its proper divisors (1).

13539949 is an equidigital number, since it uses as much as digits as its factorization.

13539949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 13539949 is about 3679.6669686264. Note that the first 3 decimals coincide. The cubic root of 13539949 is about 238.3447971839.

The spelling of 13539949 in words is "thirteen million, five hundred thirty-nine thousand, nine hundred forty-nine".