83820977 has 2 divisors, whose sum is σ = 83820978. Its totient is φ = 83820976.

The previous prime is 83820959. The next prime is 83821013. The reversal of 83820977 is 77902838.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81558961 + 2262016 = 9031^2 + 1504^2 .

It is a cyclic number.

It is not a de Polignac number, because 83820977 - 2⁸ = 83820721 is a prime.

It is not a weakly prime, because it can be changed into another prime (83820907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41910488 + 41910489.

It is an arithmetic number, because the mean of its divisors is an integer number (41910489).

Almost surely, 2^83820977 is an apocalyptic number.

It is an amenable number.

83820977 is a deficient number, since it is larger than the sum of its proper divisors (1).

83820977 is an equidigital number, since it uses as much as digits as its factorization.

83820977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 83820977 is about 9155.3796753603. The cubic root of 83820977 is about 437.6405678378.

The spelling of 83820977 in words is "eighty-three million, eight hundred twenty thousand, nine hundred seventy-seven".