8999416381 has 2 divisors, whose sum is σ = 8999416382. Its totient is φ = 8999416380.

The previous prime is 8999416357. The next prime is 8999416399. The reversal of 8999416381 is 1836149998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8910416025 + 89000356 = 94395^2 + 9434^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999416381 - 2⁹ = 8999415869 is a prime.

It is a super-2 number, since 2×8999416381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8999416781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499708190 + 4499708191.

It is an arithmetic number, because the mean of its divisors is an integer number (4499708191).

Almost surely, 2^8999416381 is an apocalyptic number.

It is an amenable number.

8999416381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999416381 is an equidigital number, since it uses as much as digits as its factorization.

8999416381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 58.

The square root of 8999416381 is about 94865.2538129741. The cubic root of 8999416381 is about 2080.0388599896.

The spelling of 8999416381 in words is "eight billion, nine hundred ninety-nine million, four hundred sixteen thousand, three hundred eighty-one".