13640791 has 2 divisors, whose sum is σ = 13640792. Its totient is φ = 13640790.

The previous prime is 13640777. The next prime is 13640807. The reversal of 13640791 is 19704631.

It is a happy number.

13640791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19704631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13640791 - 2²¹ = 11543639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13640491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820395 + 6820396.

It is an arithmetic number, because the mean of its divisors is an integer number (6820396).

Almost surely, 2^13640791 is an apocalyptic number.

13640791 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640791 is an equidigital number, since it uses as much as digits as its factorization.

13640791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 13640791 is about 3693.3441486003. The cubic root of 13640791 is about 238.9350441756.

The spelling of 13640791 in words is "thirteen million, six hundred forty thousand, seven hundred ninety-one".