83779513 has 2 divisors, whose sum is σ = 83779514. Its totient is φ = 83779512.

The previous prime is 83779511. The next prime is 83779517. The reversal of 83779513 is 31597738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78996544 + 4782969 = 8888^2 + 2187^2 .

It is a cyclic number.

It is not a de Polignac number, because 83779513 - 2¹ = 83779511 is a prime.

Together with 83779511, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 83779513.

It is not a weakly prime, because it can be changed into another prime (83779511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41889756 + 41889757.

It is an arithmetic number, because the mean of its divisors is an integer number (41889757).

Almost surely, 2^83779513 is an apocalyptic number.

It is an amenable number.

83779513 is a deficient number, since it is larger than the sum of its proper divisors (1).

83779513 is an equidigital number, since it uses as much as digits as its factorization.

83779513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 83779513 is about 9153.1149342724. The cubic root of 83779513 is about 437.5683928996.

The spelling of 83779513 in words is "eighty-three million, seven hundred seventy-nine thousand, five hundred thirteen".