91251225 has 48 divisors (see below), whose sum is σ = 180544000. Its totient is φ = 44919360.

The previous prime is 91251221. The next prime is 91251239. The reversal of 91251225 is 52215219.

It is not a de Polignac number, because 91251225 - 2² = 91251221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3576 + ... + 13974.

Almost surely, 2^91251225 is an apocalyptic number.

It is an amenable number.

91251225 is a deficient number, since it is larger than the sum of its proper divisors (89292775).

91251225 is a wasteful number, since it uses less digits than its factorization.

91251225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10431 (or 10420 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 91251225 is about 9552.5507064867. The cubic root of 91251225 is about 450.2076819146.

The spelling of 91251225 in words is "ninety-one million, two hundred fifty-one thousand, two hundred twenty-five".