88991091 has 24 divisors (see below), whose sum is σ = 147197024. Its totient is φ = 50751360.

The previous prime is 88991083. The next prime is 88991099. The reversal of 88991091 is 19019988.

It is an interprime number because it is at equal distance from previous prime (88991083) and next prime (88991099).

It is not a de Polignac number, because 88991091 - 2³ = 88991083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (88991099) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40575 + ... + 42711.

Almost surely, 2^88991091 is an apocalyptic number.

88991091 is a deficient number, since it is larger than the sum of its proper divisors (58205933).

88991091 is a wasteful number, since it uses less digits than its factorization.

88991091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 88991091 is about 9433.5089441840. The cubic root of 88991091 is about 446.4596115280.

The spelling of 88991091 in words is "eighty-eight million, nine hundred ninety-one thousand, ninety-one".