15001891 has 2 divisors, whose sum is σ = 15001892. Its totient is φ = 15001890.

The previous prime is 15001873. The next prime is 15001897. The reversal of 15001891 is 19810051.

15001891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (19810051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15001891 - 2²³ = 6613283 is a prime.

It is not a weakly prime, because it can be changed into another prime (15001897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7500945 + 7500946.

It is an arithmetic number, because the mean of its divisors is an integer number (7500946).

Almost surely, 2^15001891 is an apocalyptic number.

15001891 is a deficient number, since it is larger than the sum of its proper divisors (1).

15001891 is an equidigital number, since it uses as much as digits as its factorization.

15001891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 15001891 is about 3873.2274655641. The cubic root of 15001891 is about 246.6315705688.

The spelling of 15001891 in words is "fifteen million, one thousand, eight hundred ninety-one".