13642649 has 2 divisors, whose sum is σ = 13642650. Its totient is φ = 13642648.

The previous prime is 13642639. The next prime is 13642667. The reversal of 13642649 is 94624631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12730624 + 912025 = 3568^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 13642649 - 2⁴ = 13642633 is a prime.

It is a super-2 number, since 2×13642649² = 372243743474402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13642609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6821324 + 6821325.

It is an arithmetic number, because the mean of its divisors is an integer number (6821325).

Almost surely, 2^13642649 is an apocalyptic number.

It is an amenable number.

13642649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13642649 is an equidigital number, since it uses as much as digits as its factorization.

13642649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 13642649 is about 3693.5956735950. The cubic root of 13642649 is about 238.9458920597.

The spelling of 13642649 in words is "thirteen million, six hundred forty-two thousand, six hundred forty-nine".