919116421 has 2 divisors, whose sum is σ = 919116422. Its totient is φ = 919116420.

The previous prime is 919116403. The next prime is 919116479. The reversal of 919116421 is 124611919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 877048225 + 42068196 = 29615^2 + 6486^2 .

It is a cyclic number.

It is not a de Polignac number, because 919116421 - 2⁹ = 919115909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919116521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459558210 + 459558211.

It is an arithmetic number, because the mean of its divisors is an integer number (459558211).

Almost surely, 2^919116421 is an apocalyptic number.

It is an amenable number.

919116421 is a deficient number, since it is larger than the sum of its proper divisors (1).

919116421 is an equidigital number, since it uses as much as digits as its factorization.

919116421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 919116421 is about 30316.9329088547. The cubic root of 919116421 is about 972.2773645079.

The spelling of 919116421 in words is "nine hundred nineteen million, one hundred sixteen thousand, four hundred twenty-one".