917424921 has 16 divisors (see below), whose sum is σ = 1405230464. Its totient is φ = 521524224.

The previous prime is 917424917. The next prime is 917424929. The reversal of 917424921 is 129424719.

It is not a de Polignac number, because 917424921 - 2² = 917424917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 917424921.

It is not an unprimeable number, because it can be changed into a prime (917424929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109126 + ... + 117231.

It is an arithmetic number, because the mean of its divisors is an integer number (87826904).

Almost surely, 2^917424921 is an apocalyptic number.

It is an amenable number.

917424921 is a deficient number, since it is larger than the sum of its proper divisors (487805543).

917424921 is a wasteful number, since it uses less digits than its factorization.

917424921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226560.

The product of its digits is 36288, while the sum is 39.

The square root of 917424921 is about 30289.0231106914. The cubic root of 917424921 is about 971.6805532502.

The spelling of 917424921 in words is "nine hundred seventeen million, four hundred twenty-four thousand, nine hundred twenty-one".