919616081 has 2 divisors, whose sum is σ = 919616082. Its totient is φ = 919616080.

The previous prime is 919616063. The next prime is 919616143. The reversal of 919616081 is 180616919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627753025 + 291863056 = 25055^2 + 17084^2 .

It is a cyclic number.

It is not a de Polignac number, because 919616081 - 2²⁶ = 852507217 is a prime.

It is a super-3 number, since 3×919616081³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (919616021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459808040 + 459808041.

It is an arithmetic number, because the mean of its divisors is an integer number (459808041).

Almost surely, 2^919616081 is an apocalyptic number.

It is an amenable number.

919616081 is a deficient number, since it is larger than the sum of its proper divisors (1).

919616081 is an equidigital number, since it uses as much as digits as its factorization.

919616081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 919616081 is about 30325.1723985207. The cubic root of 919616081 is about 972.4535192329.

The spelling of 919616081 in words is "nine hundred nineteen million, six hundred sixteen thousand, eighty-one".