91000225157 has 4 divisors (see below), whose sum is σ = 96353179596. Its totient is φ = 85647270720.

The previous prime is 91000225139. The next prime is 91000225177. The reversal of 91000225157 is 75152200019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85260496036 + 5739729121 = 291994^2 + 75761^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000225157 - 2²⁰ = 90999176581 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 (91000225177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676477194 + ... + 2676477227.

It is an arithmetic number, because the mean of its divisors is an integer number (24088294899).

Almost surely, 2^91000225157 is an apocalyptic number.

It is an amenable number.

91000225157 is a deficient number, since it is larger than the sum of its proper divisors (5352954439).

91000225157 is a wasteful number, since it uses less digits than its factorization.

91000225157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352954438.

The product of its (nonzero) digits is 6300, while the sum is 32.

The spelling of 91000225157 in words is "ninety-one billion, two hundred twenty-five thousand, one hundred fifty-seven".