88989991 has 2 divisors, whose sum is σ = 88989992. Its totient is φ = 88989990.

The previous prime is 88989983. The next prime is 88990039. The reversal of 88989991 is 19998988.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 88989991 - 2³ = 88989983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88989931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44494995 + 44494996.

It is an arithmetic number, because the mean of its divisors is an integer number (44494996).

Almost surely, 2^88989991 is an apocalyptic number.

88989991 is a deficient number, since it is larger than the sum of its proper divisors (1).

88989991 is an equidigital number, since it uses as much as digits as its factorization.

88989991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 61.

The square root of 88989991 is about 9433.4506412023. The cubic root of 88989991 is about 446.4577719896.

The spelling of 88989991 in words is "eighty-eight million, nine hundred eighty-nine thousand, nine hundred ninety-one".