16981142 has 4 divisors (see below), whose sum is σ = 25471716. Its totient is φ = 8490570.

The previous prime is 16981127. The next prime is 16981157. The reversal of 16981142 is 24118961.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (16981127) and next prime (16981157).

It is a junction number, because it is equal to n+sod(n) for n = 16981099 and 16981108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245284 + ... + 4245287.

It is an arithmetic number, because the mean of its divisors is an integer number (6367929).

Almost surely, 2^16981142 is an apocalyptic number.

16981142 is a deficient number, since it is larger than the sum of its proper divisors (8490574).

16981142 is an equidigital number, since it uses as much as digits as its factorization.

16981142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490573.

The product of its digits is 3456, while the sum is 32.

The square root of 16981142 is about 4120.8181226548. The cubic root of 16981142 is about 257.0330469699.

The spelling of 16981142 in words is "sixteen million, nine hundred eighty-one thousand, one hundred forty-two".