16731081 has 6 divisors (see below), whose sum is σ = 24167130. Its totient is φ = 11154048.

The previous prime is 16731049. The next prime is 16731083. The reversal of 16731081 is 18013761.

It can be written as a sum of positive squares in only one way, i.e., 16646400 + 84681 = 4080^2 + 291^2 .

It is not a de Polignac number, because 16731081 - 2⁵ = 16731049 is a prime.

It is a super-2 number, since 2×16731081² = 559858142857122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16731083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 929496 + ... + 929513.

It is an arithmetic number, because the mean of its divisors is an integer number (4027855).

Almost surely, 2^16731081 is an apocalyptic number.

It is an amenable number.

16731081 is a deficient number, since it is larger than the sum of its proper divisors (7436049).

16731081 is a wasteful number, since it uses less digits than its factorization.

16731081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859015 (or 1859012 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 16731081 is about 4090.3644091939. The cubic root of 16731081 is about 255.7651298371.

The spelling of 16731081 in words is "sixteen million, seven hundred thirty-one thousand, eighty-one".