15384991 has 2 divisors, whose sum is σ = 15384992. Its totient is φ = 15384990.

The previous prime is 15384989. The next prime is 15385037. The reversal of 15384991 is 19948351.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15384991 - 2¹ = 15384989 is a prime.

Together with 15384989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15384931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7692495 + 7692496.

It is an arithmetic number, because the mean of its divisors is an integer number (7692496).

Almost surely, 2^15384991 is an apocalyptic number.

15384991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15384991 is an equidigital number, since it uses as much as digits as its factorization.

15384991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 15384991 is about 3922.3705842258. The cubic root of 15384991 is about 248.7133413988.

The spelling of 15384991 in words is "fifteen million, three hundred eighty-four thousand, nine hundred ninety-one".