83971961 has 2 divisors, whose sum is σ = 83971962. Its totient is φ = 83971960.

The previous prime is 83971957. The next prime is 83971967. The reversal of 83971961 is 16917938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 19971961 = 8000^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 83971961 - 2² = 83971957 is a prime.

It is not a weakly prime, because it can be changed into another prime (83971967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41985980 + 41985981.

It is an arithmetic number, because the mean of its divisors is an integer number (41985981).

Almost surely, 2^83971961 is an apocalyptic number.

It is an amenable number.

83971961 is a deficient number, since it is larger than the sum of its proper divisors (1).

83971961 is an equidigital number, since it uses as much as digits as its factorization.

83971961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 83971961 is about 9163.6216093857. The cubic root of 83971961 is about 437.9031794638.

The spelling of 83971961 in words is "eighty-three million, nine hundred seventy-one thousand, nine hundred sixty-one".