91251230 has 24 divisors (see below), whose sum is σ = 191069928. Its totient is φ = 31285968.

The previous prime is 91251221. The next prime is 91251239. The reversal of 91251230 is 3215219.

It is an interprime number because it is at equal distance from previous prime (91251221) and next prime (91251239).

It is a junction number, because it is equal to n+sod(n) for n = 91251196 and 91251205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91251239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92624 + ... + 93603.

It is an arithmetic number, because the mean of its divisors is an integer number (7961247).

Almost surely, 2^91251230 is an apocalyptic number.

91251230 is an abundant number, since it is smaller than the sum of its proper divisors (99818698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91251230 is a wasteful number, since it uses less digits than its factorization.

91251230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186248 (or 186241 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 91251230 is about 9552.5509681969. The cubic root of 91251230 is about 450.2076901375.

Adding to 91251230 its reverse (3215219), we get a palindrome (94466449).

The spelling of 91251230 in words is "ninety-one million, two hundred fifty-one thousand, two hundred thirty".