83780551 has 2 divisors, whose sum is σ = 83780552. Its totient is φ = 83780550.

The previous prime is 83780441. The next prime is 83780563. The reversal of 83780551 is 15508738.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83780551 - 2⁷ = 83780423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83780551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83780581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41890275 + 41890276.

It is an arithmetic number, because the mean of its divisors is an integer number (41890276).

Almost surely, 2^83780551 is an apocalyptic number.

83780551 is a deficient number, since it is larger than the sum of its proper divisors (1).

83780551 is an equidigital number, since it uses as much as digits as its factorization.

83780551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 83780551 is about 9153.1716361052. The cubic root of 83780551 is about 437.5702000006.

The spelling of 83780551 in words is "eighty-three million, seven hundred eighty thousand, five hundred fifty-one".