13629991 has 2 divisors, whose sum is σ = 13629992. Its totient is φ = 13629990.

The previous prime is 13629989. The next prime is 13629997. The reversal of 13629991 is 19992631.

It is a weak prime.

It is an emirp because it is prime and its reverse (19992631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13629991 - 2¹ = 13629989 is a prime.

Together with 13629989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13629997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6814995 + 6814996.

It is an arithmetic number, because the mean of its divisors is an integer number (6814996).

Almost surely, 2^13629991 is an apocalyptic number.

13629991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13629991 is an equidigital number, since it uses as much as digits as its factorization.

13629991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 40.

The square root of 13629991 is about 3691.8817695045. The cubic root of 13629991 is about 238.8719691480.

The spelling of 13629991 in words is "thirteen million, six hundred twenty-nine thousand, nine hundred ninety-one".