16931225 has 12 divisors (see below), whose sum is σ = 21060780. Its totient is φ = 13502400.

The previous prime is 16931219. The next prime is 16931231. The reversal of 16931225 is 52213961.

It is an interprime number because it is at equal distance from previous prime (16931219) and next prime (16931231).

It can be written as a sum of positive squares in 6 ways, for example, as 6310144 + 10621081 = 2512^2 + 3259^2 .

It is not a de Polignac number, because 16931225 - 2⁴ = 16931209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8855 + ... + 10595.

It is an arithmetic number, because the mean of its divisors is an integer number (1755065).

Almost surely, 2^16931225 is an apocalyptic number.

It is an amenable number.

16931225 is a deficient number, since it is larger than the sum of its proper divisors (4129555).

16931225 is a wasteful number, since it uses less digits than its factorization.

16931225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140 (or 2135 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 16931225 is about 4114.7569794582. The cubic root of 16931225 is about 256.7809455313.

It can be divided in two parts, 16 and 931225, that multiplied together give a square (14899600 = 3860²).

The spelling of 16931225 in words is "sixteen million, nine hundred thirty-one thousand, two hundred twenty-five".