16431725 has 6 divisors (see below), whose sum is σ = 20375370. Its totient is φ = 13145360.

The previous prime is 16431721. The next prime is 16431731. The reversal of 16431725 is 52713461.

It can be written as a sum of positive squares in 3 ways, for example, as 1885129 + 14546596 = 1373^2 + 3814^2 .

It is not a de Polignac number, because 16431725 - 2² = 16431721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16431721) 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, 328610 + ... + 328659.

It is an arithmetic number, because the mean of its divisors is an integer number (3395895).

Almost surely, 2^16431725 is an apocalyptic number.

It is an amenable number.

16431725 is a deficient number, since it is larger than the sum of its proper divisors (3943645).

16431725 is an equidigital number, since it uses as much as digits as its factorization.

16431725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657279 (or 657274 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 16431725 is about 4053.6064189805. The cubic root of 16431725 is about 254.2305396520.

The spelling of 16431725 in words is "sixteen million, four hundred thirty-one thousand, seven hundred twenty-five".