15280991 has 8 divisors (see below), whose sum is σ = 16827264. Its totient is φ = 13760920.

The previous prime is 15280981. The next prime is 15281023. The reversal of 15280991 is 19908251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15280991 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 (15280961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5315 + ... + 7668.

It is an arithmetic number, because the mean of its divisors is an integer number (2103408).

Almost surely, 2^15280991 is an apocalyptic number.

15280991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15280991 is a deficient number, since it is larger than the sum of its proper divisors (1546273).

15280991 is a wasteful number, since it uses less digits than its factorization.

15280991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13101.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 15280991 is about 3909.0908150106. The cubic root of 15280991 is about 248.1516534720.

The spelling of 15280991 in words is "fifteen million, two hundred eighty thousand, nine hundred ninety-one".