691416125 has 16 divisors (see below), whose sum is σ = 867902256. Its totient is φ = 549918400.

The previous prime is 691416113. The next prime is 691416127. The reversal of 691416125 is 521614196.

691416125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3193369 + 688222756 = 1787^2 + 26234^2 .

It is not a de Polignac number, because 691416125 - 2⁸ = 691415869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691416127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5639 + ... + 37611.

It is an arithmetic number, because the mean of its divisors is an integer number (54243891).

Almost surely, 2^691416125 is an apocalyptic number.

It is an amenable number.

691416125 is a deficient number, since it is larger than the sum of its proper divisors (176486131).

691416125 is a wasteful number, since it uses less digits than its factorization.

691416125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32161 (or 32151 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 691416125 is about 26294.7927354448. The cubic root of 691416125 is about 884.2597041570.

The spelling of 691416125 in words is "six hundred ninety-one million, four hundred sixteen thousand, one hundred twenty-five".