91025901 has 6 divisors (see below), whose sum is σ = 131481870. Its totient is φ = 60683928.

The previous prime is 91025899. The next prime is 91025911. The reversal of 91025901 is 10952019.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 90269001 + 756900 = 9501^2 + 870^2 .

It is not a de Polignac number, because 91025901 - 2¹ = 91025899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91025911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5056986 + ... + 5057003.

It is an arithmetic number, because the mean of its divisors is an integer number (21913645).

Almost surely, 2^91025901 is an apocalyptic number.

It is an amenable number.

91025901 is a deficient number, since it is larger than the sum of its proper divisors (40455969).

91025901 is a wasteful number, since it uses less digits than its factorization.

91025901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10113995 (or 10113992 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 91025901 is about 9540.7494988601. The cubic root of 91025901 is about 449.8368149048.

The spelling of 91025901 in words is "ninety-one million, twenty-five thousand, nine hundred one".