13649957 has 2 divisors, whose sum is σ = 13649958. Its totient is φ = 13649956.

The previous prime is 13649953. The next prime is 13649959. The reversal of 13649957 is 75994631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9431041 + 4218916 = 3071^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 13649957 - 2² = 13649953 is a prime.

It is a super-2 number, since 2×13649957² = 372642652203698, which contains 22 as substring.

Together with 13649959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13649953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6824978 + 6824979.

It is an arithmetic number, because the mean of its divisors is an integer number (6824979).

Almost surely, 2^13649957 is an apocalyptic number.

It is an amenable number.

13649957 is a deficient number, since it is larger than the sum of its proper divisors (1).

13649957 is an equidigital number, since it uses as much as digits as its factorization.

13649957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 13649957 is about 3694.5848210591. The cubic root of 13649957 is about 238.9885500721.

The spelling of 13649957 in words is "thirteen million, six hundred forty-nine thousand, nine hundred fifty-seven".