15240991 has 4 divisors (see below), whose sum is σ = 15248800. Its totient is φ = 15233184.

The previous prime is 15240977. The next prime is 15240997. The reversal of 15240991 is 19904251.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 15240991 - 2¹⁵ = 15208223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15240997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1930 + ... + 5848.

It is an arithmetic number, because the mean of its divisors is an integer number (3812200).

Almost surely, 2^15240991 is an apocalyptic number.

15240991 is a deficient number, since it is larger than the sum of its proper divisors (7809).

15240991 is an equidigital number, since it uses as much as digits as its factorization.

15240991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7808.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 15240991 is about 3903.9711832953. The cubic root of 15240991 is about 247.9349410942.

The spelling of 15240991 in words is "fifteen million, two hundred forty thousand, nine hundred ninety-one".