16149861 has 60 divisors (see below), whose sum is σ = 30319212. Its totient is φ = 8491392.

The previous prime is 16149857. The next prime is 16149869. The reversal of 16149861 is 16894161.

It is a happy number.

16149861 is a `hidden beast` number, since 161 + 498 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 893025 + 15256836 = 945^2 + 3906^2 .

It is not a de Polignac number, because 16149861 - 2² = 16149857 is a prime.

It is a Curzon number.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16149869) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 51441 + ... + 51753.

Almost surely, 2^16149861 is an apocalyptic number.

It is an amenable number.

16149861 is a deficient number, since it is larger than the sum of its proper divisors (14169351).

16149861 is a wasteful number, since it uses less digits than its factorization.

16149861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 336 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 16149861 is about 4018.6889653219. The cubic root of 16149861 is about 252.7684874078.

The spelling of 16149861 in words is "sixteen million, one hundred forty-nine thousand, eight hundred sixty-one".