89077991 has 2 divisors, whose sum is σ = 89077992. Its totient is φ = 89077990.

The previous prime is 89077979. The next prime is 89077993. The reversal of 89077991 is 19977098.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89077991 - 2¹⁸ = 88815847 is a prime.

Together with 89077993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89077993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44538995 + 44538996.

It is an arithmetic number, because the mean of its divisors is an integer number (44538996).

Almost surely, 2^89077991 is an apocalyptic number.

89077991 is a deficient number, since it is larger than the sum of its proper divisors (1).

89077991 is an equidigital number, since it uses as much as digits as its factorization.

89077991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 89077991 is about 9438.1137416329. The cubic root of 89077991 is about 446.6048871883.

The spelling of 89077991 in words is "eighty-nine million, seventy-seven thousand, nine hundred ninety-one".