15691253 has 2 divisors, whose sum is σ = 15691254. Its totient is φ = 15691252.

The previous prime is 15691243. The next prime is 15691261. The reversal of 15691253 is 35219651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12945604 + 2745649 = 3598^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 15691253 - 2⁴ = 15691237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15691243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845626 + 7845627.

It is an arithmetic number, because the mean of its divisors is an integer number (7845627).

Almost surely, 2^15691253 is an apocalyptic number.

It is an amenable number.

15691253 is a deficient number, since it is larger than the sum of its proper divisors (1).

15691253 is an equidigital number, since it uses as much as digits as its factorization.

15691253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 15691253 is about 3961.2186256252. The cubic root of 15691253 is about 250.3528510835.

The spelling of 15691253 in words is "fifteen million, six hundred ninety-one thousand, two hundred fifty-three".