91000030 has 32 divisors (see below), whose sum is σ = 180296928. Its totient is φ = 32793600.

The previous prime is 91000027. The next prime is 91000051. The reversal of 91000030 is 3000019.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8770 + ... + 16090.

It is an arithmetic number, because the mean of its divisors is an integer number (5634279).

Almost surely, 2^91000030 is an apocalyptic number.

91000030 is a deficient number, since it is larger than the sum of its proper divisors (89296898).

91000030 is a wasteful number, since it uses less digits than its factorization.

91000030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7452.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 91000030 is about 9539.3935865966. The cubic root of 91000030 is about 449.7941939555.

Adding to 91000030 its reverse (3000019), we get a palindrome (94000049).

Subtracting from 91000030 its reverse (3000019), we obtain a triangular number (88000011 = T₁₃₂₆₆).

The spelling of 91000030 in words is "ninety-one million, thirty", and thus it is an aban number and an uban number.