13457891 has 2 divisors, whose sum is σ = 13457892. Its totient is φ = 13457890.

The previous prime is 13457879. The next prime is 13457923. The reversal of 13457891 is 19875431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13457891 - 2¹⁰ = 13456867 is a prime.

It is a super-2 number, since 2×13457891² = 362229660335762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13457831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6728945 + 6728946.

It is an arithmetic number, because the mean of its divisors is an integer number (6728946).

Almost surely, 2^13457891 is an apocalyptic number.

13457891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13457891 is an equidigital number, since it uses as much as digits as its factorization.

13457891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 13457891 is about 3668.4998296306. The cubic root of 13457891 is about 237.8623300506.

The spelling of 13457891 in words is "thirteen million, four hundred fifty-seven thousand, eight hundred ninety-one".