8991420127 has 2 divisors, whose sum is σ = 8991420128. Its totient is φ = 8991420126.

The previous prime is 8991420029. The next prime is 8991420143. The reversal of 8991420127 is 7210241998.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8991420127 - 2¹⁵ = 8991387359 is a prime.

It is a super-2 number, since 2×8991420127² (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 (8991420157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4495710063 + 4495710064.

It is an arithmetic number, because the mean of its divisors is an integer number (4495710064).

Almost surely, 2^8991420127 is an apocalyptic number.

8991420127 is a deficient number, since it is larger than the sum of its proper divisors (1).

8991420127 is an equidigital number, since it uses as much as digits as its factorization.

8991420127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 8991420127 is about 94823.0991214693. The cubic root of 8991420127 is about 2079.4226182635.

The spelling of 8991420127 in words is "eight billion, nine hundred ninety-one million, four hundred twenty thousand, one hundred twenty-seven".