99851551 has 2 divisors, whose sum is σ = 99851552. Its totient is φ = 99851550.

The previous prime is 99851539. The next prime is 99851569. The reversal of 99851551 is 15515899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99851551 - 2⁵ = 99851519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99851498 and 99851507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99851501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49925775 + 49925776.

It is an arithmetic number, because the mean of its divisors is an integer number (49925776).

Almost surely, 2^99851551 is an apocalyptic number.

99851551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99851551 is an equidigital number, since it uses as much as digits as its factorization.

99851551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 43.

The square root of 99851551 is about 9992.5747933153. The cubic root of 99851551 is about 463.9290898748.

The spelling of 99851551 in words is "ninety-nine million, eight hundred fifty-one thousand, five hundred fifty-one".