919424621 has 2 divisors, whose sum is σ = 919424622. Its totient is φ = 919424620.

The previous prime is 919424599. The next prime is 919424647. The reversal of 919424621 is 126424919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 903663721 + 15760900 = 30061^2 + 3970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-919424621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919424021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459712310 + 459712311.

It is an arithmetic number, because the mean of its divisors is an integer number (459712311).

Almost surely, 2^919424621 is an apocalyptic number.

It is an amenable number.

919424621 is a deficient number, since it is larger than the sum of its proper divisors (1).

919424621 is an equidigital number, since it uses as much as digits as its factorization.

919424621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 919424621 is about 30322.0154508238. The cubic root of 919424621 is about 972.3860277085.

The spelling of 919424621 in words is "nine hundred nineteen million, four hundred twenty-four thousand, six hundred twenty-one".