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BaseRepresentation
bin1011110011010…
…10001010011111
320220021202211101
411321222022133
5200321012431
613453533531
72311331425
oct571521237
9226252741
1099000991
1150979a01
12291a42a7
1317683b8b
14d211115
158a58961
hex5e6a29f

99000991 has 2 divisors, whose sum is σ = 99000992. Its totient is φ = 99000990.

The previous prime is 99000977. The next prime is 99001031. The reversal of 99000991 is 19900099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99000991 - 29 = 99000479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99000991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99000791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49500495 + 49500496.

It is an arithmetic number, because the mean of its divisors is an integer number (49500496).

Almost surely, 299000991 is an apocalyptic number.

99000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

99000991 is an equidigital number, since it uses as much as digits as its factorization.

99000991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 99000991 is about 9949.9241705653. The cubic root of 99000991 is about 462.6080444924.

The spelling of 99000991 in words is "ninety-nine million, nine hundred ninety-one", and thus it is an aban number.