13691025 has 30 divisors (see below), whose sum is σ = 25364262. Its totient is φ = 7300800.

The previous prime is 13690997. The next prime is 13691033. The reversal of 13691025 is 52019631.

It can be written as a sum of positive squares in 3 ways, for example, as 2178576 + 11512449 = 1476^2 + 3393^2 .

It is not a de Polignac number, because 13691025 - 2⁵ = 13690993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13691025.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1356 + ... + 5405.

Almost surely, 2^13691025 is an apocalyptic number.

13691025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13691025 is a deficient number, since it is larger than the sum of its proper divisors (11673237).

13691025 is an equidigital number, since it uses as much as digits as its factorization.

13691025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783 (or 6769 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 13691025 is about 3700.1385109209. The cubic root of 13691025 is about 239.2279880693.

The spelling of 13691025 in words is "thirteen million, six hundred ninety-one thousand, twenty-five".