16401911 has 2 divisors, whose sum is σ = 16401912. Its totient is φ = 16401910.

The previous prime is 16401887. The next prime is 16401937. The reversal of 16401911 is 11910461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16401911 - 2²² = 12207607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16401811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200955 + 8200956.

It is an arithmetic number, because the mean of its divisors is an integer number (8200956).

Almost surely, 2^16401911 is an apocalyptic number.

16401911 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401911 is an equidigital number, since it uses as much as digits as its factorization.

16401911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 16401911 is about 4049.9272832978. The cubic root of 16401911 is about 254.0766864983.

It can be divided in two parts, 16401 and 911, that multiplied together give a triangular number (14941311 = T₅₄₆₆).

The spelling of 16401911 in words is "sixteen million, four hundred one thousand, nine hundred eleven".