16381971 has 12 divisors (see below), whose sum is σ = 24908520. Its totient is φ = 10346400.

The previous prime is 16381961. The next prime is 16381979. The reversal of 16381971 is 17918361.

16381971 is a `hidden beast` number, since 1 + 638 + 19 + 7 + 1 = 666.

It is not a de Polignac number, because 16381971 - 2¹³ = 16373779 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16381979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47730 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (2075710).

Almost surely, 2^16381971 is an apocalyptic number.

16381971 is a deficient number, since it is larger than the sum of its proper divisors (8526549).

16381971 is a wasteful number, since it uses less digits than its factorization.

16381971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95826 (or 95823 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 16381971 is about 4047.4647620455. The cubic root of 16381971 is about 253.9736833875.

The spelling of 16381971 in words is "sixteen million, three hundred eighty-one thousand, nine hundred seventy-one".