83977889 has 2 divisors, whose sum is σ = 83977890. Its totient is φ = 83977888.

The previous prime is 83977781. The next prime is 83977903. The reversal of 83977889 is 98877938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77176225 + 6801664 = 8785^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 83977889 - 2²⁴ = 67200673 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83977189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41988944 + 41988945.

It is an arithmetic number, because the mean of its divisors is an integer number (41988945).

Almost surely, 2^83977889 is an apocalyptic number.

It is an amenable number.

83977889 is a deficient number, since it is larger than the sum of its proper divisors (1).

83977889 is an equidigital number, since it uses as much as digits as its factorization.

83977889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 59.

The square root of 83977889 is about 9163.9450565791. The cubic root of 83977889 is about 437.9134838120.

The spelling of 83977889 in words is "eighty-three million, nine hundred seventy-seven thousand, eight hundred eighty-nine".