15244991 has 2 divisors, whose sum is σ = 15244992. Its totient is φ = 15244990.

The previous prime is 15244969. The next prime is 15244997. The reversal of 15244991 is 19944251.

It is a strong prime.

It is an emirp because it is prime and its reverse (19944251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15244991 - 2¹⁴ = 15228607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15244997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7622495 + 7622496.

It is an arithmetic number, because the mean of its divisors is an integer number (7622496).

Almost surely, 2^15244991 is an apocalyptic number.

15244991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15244991 is an equidigital number, since it uses as much as digits as its factorization.

15244991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 15244991 is about 3904.4834485499. The cubic root of 15244991 is about 247.9566293824.

The spelling of 15244991 in words is "fifteen million, two hundred forty-four thousand, nine hundred ninety-one".