83978953 has 2 divisors, whose sum is σ = 83978954. Its totient is φ = 83978952.

The previous prime is 83978903. The next prime is 83979017. The reversal of 83978953 is 35987938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82228624 + 1750329 = 9068^2 + 1323^2 .

It is a cyclic number.

It is not a de Polignac number, because 83978953 - 2²¹ = 81881801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83978953.

It is not a weakly prime, because it can be changed into another prime (83978903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41989476 + 41989477.

It is an arithmetic number, because the mean of its divisors is an integer number (41989477).

Almost surely, 2^83978953 is an apocalyptic number.

It is an amenable number.

83978953 is a deficient number, since it is larger than the sum of its proper divisors (1).

83978953 is an equidigital number, since it uses as much as digits as its factorization.

83978953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 83978953 is about 9164.0031099951. The cubic root of 83978953 is about 437.9153332591.

The spelling of 83978953 in words is "eighty-three million, nine hundred seventy-eight thousand, nine hundred fifty-three".