91029087 has 6 divisors (see below), whose sum is σ = 131486472. Its totient is φ = 60686052.

The previous prime is 91029049. The next prime is 91029097. The reversal of 91029087 is 78092019.

It is a happy number.

It is not a de Polignac number, because 91029087 - 2⁸ = 91028831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91029047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5057163 + ... + 5057180.

It is an arithmetic number, because the mean of its divisors is an integer number (21914412).

Almost surely, 2^91029087 is an apocalyptic number.

91029087 is a deficient number, since it is larger than the sum of its proper divisors (40457385).

91029087 is a wasteful number, since it uses less digits than its factorization.

91029087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10114349 (or 10114346 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 91029087 is about 9540.9164654136. The cubic root of 91029087 is about 449.8420630937.

The spelling of 91029087 in words is "ninety-one million, twenty-nine thousand, eighty-seven".