90991011 has 8 divisors (see below), whose sum is σ = 121682704. Its totient is φ = 60480000.

The previous prime is 90990997. The next prime is 90991027. The reversal of 90991011 is 11019909.

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

It is not a de Polignac number, because 90991011 - 2⁷ = 90990883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90991011.

It is not an unprimeable number, because it can be changed into a prime (90991031) 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, 43990 + ... + 46011.

It is an arithmetic number, because the mean of its divisors is an integer number (15210338).

Almost surely, 2^90991011 is an apocalyptic number.

90991011 is a deficient number, since it is larger than the sum of its proper divisors (30691693).

90991011 is a wasteful number, since it uses less digits than its factorization.

90991011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90341.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 90991011 is about 9538.9208509139. The cubic root of 90991011 is about 449.7793337850.

It can be divided in two parts, 9099 and 1011, that multiplied together give a square (9199089 = 3033²).

The spelling of 90991011 in words is "ninety million, nine hundred ninety-one thousand, eleven".