89977997 has 2 divisors, whose sum is σ = 89977998. Its totient is φ = 89977996.

The previous prime is 89977967. The next prime is 89978023. The reversal of 89977997 is 79977998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87067561 + 2910436 = 9331^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 89977997 - 2⁶ = 89977933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89977907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44988998 + 44988999.

It is an arithmetic number, because the mean of its divisors is an integer number (44988999).

Almost surely, 2^89977997 is an apocalyptic number.

It is an amenable number.

89977997 is a deficient number, since it is larger than the sum of its proper divisors (1).

89977997 is an equidigital number, since it uses as much as digits as its factorization.

89977997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18003384, while the sum is 65.

The square root of 89977997 is about 9485.6732496961. The cubic root of 89977997 is about 448.1039515501.

Subtracting from 89977997 its reverse (79977998), we obtain a palindrome (9999999).

The spelling of 89977997 in words is "eighty-nine million, nine hundred seventy-seven thousand, nine hundred ninety-seven".