99945691 has 2 divisors, whose sum is σ = 99945692. Its totient is φ = 99945690.

The previous prime is 99945683. The next prime is 99945707. The reversal of 99945691 is 19654999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99945691 - 2³ = 99945683 is a prime.

It is a super-2 number, since 2×99945691² = 19978282298934962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99945611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49972845 + 49972846.

It is an arithmetic number, because the mean of its divisors is an integer number (49972846).

Almost surely, 2^99945691 is an apocalyptic number.

99945691 is a deficient number, since it is larger than the sum of its proper divisors (1).

99945691 is an equidigital number, since it uses as much as digits as its factorization.

99945691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 52.

The square root of 99945691 is about 9997.2841812164. The cubic root of 99945691 is about 464.0748414627.

The spelling of 99945691 in words is "ninety-nine million, nine hundred forty-five thousand, six hundred ninety-one".