91306225 has 24 divisors (see below), whose sum is σ = 116242560. Its totient is φ = 71123520.

The previous prime is 91306223. The next prime is 91306231. The reversal of 91306225 is 52260319.

It is not a de Polignac number, because 91306225 - 2¹ = 91306223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91306193 and 91306202.

It is not an unprimeable number, because it can be changed into a prime (91306223) 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, 163647 + ... + 164203.

It is an arithmetic number, because the mean of its divisors is an integer number (4843440).

Almost surely, 2^91306225 is an apocalyptic number.

It is an amenable number.

91306225 is a deficient number, since it is larger than the sum of its proper divisors (24936335).

91306225 is a wasteful number, since it uses less digits than its factorization.

91306225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 91306225 is about 9555.4290850804. The cubic root of 91306225 is about 450.2981152187.

The spelling of 91306225 in words is "ninety-one million, three hundred six thousand, two hundred twenty-five".