91000475 has 6 divisors (see below), whose sum is σ = 112840620. Its totient is φ = 72800360.

The previous prime is 91000451. The next prime is 91000499. The reversal of 91000475 is 57400019.

It is an interprime number because it is at equal distance from previous prime (91000451) and next prime (91000499).

It is not a de Polignac number, because 91000475 - 2¹⁰ = 90999451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1819985 + ... + 1820034.

It is an arithmetic number, because the mean of its divisors is an integer number (18806770).

Almost surely, 2^91000475 is an apocalyptic number.

91000475 is a deficient number, since it is larger than the sum of its proper divisors (21840145).

91000475 is a wasteful number, since it uses less digits than its factorization.

91000475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640029 (or 3640024 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 91000475 is about 9539.4169109018. The cubic root of 91000475 is about 449.7949271350.

The spelling of 91000475 in words is "ninety-one million, four hundred seventy-five", and thus it is an aban number.