16426591 has 4 divisors (see below), whose sum is σ = 16671832. Its totient is φ = 16181352.

The previous prime is 16426589. The next prime is 16426601. The reversal of 16426591 is 19562461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19562461 = 17 ⋅1150733.

It is a cyclic number.

It is not a de Polignac number, because 16426591 - 2¹ = 16426589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16424591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122520 + ... + 122653.

It is an arithmetic number, because the mean of its divisors is an integer number (4167958).

Almost surely, 2^16426591 is an apocalyptic number.

16426591 is a deficient number, since it is larger than the sum of its proper divisors (245241).

16426591 is an equidigital number, since it uses as much as digits as its factorization.

16426591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245240.

The product of its digits is 12960, while the sum is 34.

The square root of 16426591 is about 4052.9731062518. The cubic root of 16426591 is about 254.2040592602.

The spelling of 16426591 in words is "sixteen million, four hundred twenty-six thousand, five hundred ninety-one".