83642551 has 2 divisors, whose sum is σ = 83642552. Its totient is φ = 83642550.

The previous prime is 83642543. The next prime is 83642609. The reversal of 83642551 is 15524638.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83642551 - 2³ = 83642543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83642521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41821275 + 41821276.

It is an arithmetic number, because the mean of its divisors is an integer number (41821276).

Almost surely, 2^83642551 is an apocalyptic number.

83642551 is a deficient number, since it is larger than the sum of its proper divisors (1).

83642551 is an equidigital number, since it uses as much as digits as its factorization.

83642551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 83642551 is about 9145.6301587151. The cubic root of 83642551 is about 437.3298185450.

The spelling of 83642551 in words is "eighty-three million, six hundred forty-two thousand, five hundred fifty-one".