16142981 has 4 divisors (see below), whose sum is σ = 16195872. Its totient is φ = 16090092.

The previous prime is 16142963. The next prime is 16142993. The reversal of 16142981 is 18924161.

16142981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16142981 - 2¹⁴ = 16126597 is a prime.

It is a super-2 number, since 2×16142981² = 521191671132722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16142921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25985 + ... + 26598.

It is an arithmetic number, because the mean of its divisors is an integer number (4048968).

Almost surely, 2^16142981 is an apocalyptic number.

It is an amenable number.

16142981 is a deficient number, since it is larger than the sum of its proper divisors (52891).

16142981 is an equidigital number, since it uses as much as digits as its factorization.

16142981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52890.

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

The square root of 16142981 is about 4017.8328735775. The cubic root of 16142981 is about 252.7325883537.

The spelling of 16142981 in words is "sixteen million, one hundred forty-two thousand, nine hundred eighty-one".