15712891 has 2 divisors, whose sum is σ = 15712892. Its totient is φ = 15712890.

The previous prime is 15712871. The next prime is 15712897. The reversal of 15712891 is 19821751.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15712891 - 2⁵ = 15712859 is a prime.

It is not a weakly prime, because it can be changed into another prime (15712897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856445 + 7856446.

It is an arithmetic number, because the mean of its divisors is an integer number (7856446).

Almost surely, 2^15712891 is an apocalyptic number.

15712891 is a deficient number, since it is larger than the sum of its proper divisors (1).

15712891 is an equidigital number, since it uses as much as digits as its factorization.

15712891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 15712891 is about 3963.9489149080. The cubic root of 15712891 is about 250.4678758226.

The spelling of 15712891 in words is "fifteen million, seven hundred twelve thousand, eight hundred ninety-one".