16425891 has 24 divisors (see below), whose sum is σ = 24648624. Its totient is φ = 10532160.

The previous prime is 16425881. The next prime is 16425907. The reversal of 16425891 is 19852461.

16425891 is a `hidden beast` number, since 1 + 642 + 5 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 16425891 - 2⁷ = 16425763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16425881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35401 + ... + 35861.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026).

Almost surely, 2^16425891 is an apocalyptic number.

16425891 is a deficient number, since it is larger than the sum of its proper divisors (8222733).

16425891 is a wasteful number, since it uses less digits than its factorization.

16425891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 608 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 16425891 is about 4052.8867489729. The cubic root of 16425891 is about 254.2004483391.

The spelling of 16425891 in words is "sixteen million, four hundred twenty-five thousand, eight hundred ninety-one".