99811691 has 8 divisors (see below), whose sum is σ = 116497920. Its totient is φ = 83732328.

The previous prime is 99811609. The next prime is 99811717. The reversal of 99811691 is 19611899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99811691 - 2²² = 95617387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99811091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151361 + ... + 152018.

It is an arithmetic number, because the mean of its divisors is an integer number (14562240).

Almost surely, 2^99811691 is an apocalyptic number.

99811691 is a deficient number, since it is larger than the sum of its proper divisors (16686229).

99811691 is a wasteful number, since it uses less digits than its factorization.

99811691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303433.

The product of its digits is 34992, while the sum is 44.

The square root of 99811691 is about 9990.5801132867. The cubic root of 99811691 is about 463.8673493058.

The spelling of 99811691 in words is "ninety-nine million, eight hundred eleven thousand, six hundred ninety-one".