915244009 has 3 divisors (see below), whose sum is σ = 915274263. Its totient is φ = 915213756.

The previous prime is 915244007. The next prime is 915244087. The reversal of 915244009 is 900442519.

The square root of 915244009 is 30253.

It is a perfect power (a square), and thus also a powerful number.

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 can be written as a sum of positive squares in only one way, i.e., 876456025 + 38787984 = 29605^2 + 6228^2 .

It is not a de Polignac number, because 915244009 - 2¹ = 915244007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (915244007) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15127 + ... + 45379.

It is an arithmetic number, because the mean of its divisors is an integer number (305091421).

Almost surely, 2^915244009 is an apocalyptic number.

915244009 is the 30253-rd square number.

915244009 is the 15127-th centered octagonal number.

It is an amenable number.

915244009 is a deficient number, since it is larger than the sum of its proper divisors (30254).

915244009 is an frugal number, since it uses more digits than its factorization.

915244009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60506 (or 30253 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The cubic root of 915244009 is about 970.9099793053.

It can be divided in two parts, 91 and 5244009, that added together give a square (5244100 = 2290²).

The spelling of 915244009 in words is "nine hundred fifteen million, two hundred forty-four thousand, nine".