91025559 has 24 divisors (see below), whose sum is σ = 140992880. Its totient is φ = 58036176.

The previous prime is 91025549. The next prime is 91025563. The reversal of 91025559 is 95552019.

It is not a de Polignac number, because 91025559 - 2¹⁷ = 90894487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91025549) 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, 11097 + ... + 17469.

Almost surely, 2^91025559 is an apocalyptic number.

91025559 is a deficient number, since it is larger than the sum of its proper divisors (49967321).

91025559 is a wasteful number, since it uses less digits than its factorization.

91025559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6428 (or 6399 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 91025559 is about 9540.7315757231. The cubic root of 91025559 is about 449.8362515326.

The spelling of 91025559 in words is "ninety-one million, twenty-five thousand, five hundred fifty-nine".