915649 has 4 divisors (see below), whose sum is σ = 1046464. Its totient is φ = 784836.

The previous prime is 915641. The next prime is 915659. The reversal of 915649 is 946519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 915649 - 2³ = 915641 is a prime.

It is a Duffinian number.

915649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (915641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65397 + ... + 65410.

It is an arithmetic number, because the mean of its divisors is an integer number (261616).

2⁹¹⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

915649 is a deficient number, since it is larger than the sum of its proper divisors (130815).

915649 is a wasteful number, since it uses less digits than its factorization.

915649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130814.

The product of its digits is 9720, while the sum is 34.

The square root of 915649 is about 956.8955010867. The cubic root of 915649 is about 97.1053165828.

The spelling of 915649 in words is "nine hundred fifteen thousand, six hundred forty-nine".