16457121 has 16 divisors (see below), whose sum is σ = 25441920. Its totient is φ = 10494000.

The previous prime is 16457087. The next prime is 16457131. The reversal of 16457121 is 12175461.

It is a happy number.

16457121 is a `hidden beast` number, since 1 + 645 + 7 + 12 + 1 = 666.

It is not a de Polignac number, because 16457121 - 2¹¹ = 16455073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16457131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12630 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (1590120).

Almost surely, 2^16457121 is an apocalyptic number.

It is an amenable number.

16457121 is a deficient number, since it is larger than the sum of its proper divisors (8984799).

16457121 is a wasteful number, since it uses less digits than its factorization.

16457121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26533 (or 26527 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 16457121 is about 4056.7377287668. The cubic root of 16457121 is about 254.3614472996.

The spelling of 16457121 in words is "sixteen million, four hundred fifty-seven thousand, one hundred twenty-one".