99443551 has 2 divisors, whose sum is σ = 99443552. Its totient is φ = 99443550.

The previous prime is 99443537. The next prime is 99443579. The reversal of 99443551 is 15534499.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99443551 - 2¹⁵ = 99410783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99443521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49721775 + 49721776.

It is an arithmetic number, because the mean of its divisors is an integer number (49721776).

Almost surely, 2^99443551 is an apocalyptic number.

99443551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99443551 is an equidigital number, since it uses as much as digits as its factorization.

99443551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 99443551 is about 9972.1387375026. The cubic root of 99443551 is about 463.2963456951.

The spelling of 99443551 in words is "ninety-nine million, four hundred forty-three thousand, five hundred fifty-one".