91251906 has 8 divisors (see below), whose sum is σ = 182503824. Its totient is φ = 30417300.

The previous prime is 91251883. The next prime is 91251911. The reversal of 91251906 is 60915219.

It is a sphenic number, since it is the product of 3 distinct primes.

91251906 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7604320 + ... + 7604331.

It is an arithmetic number, because the mean of its divisors is an integer number (22812978).

Almost surely, 2^91251906 is an apocalyptic number.

91251906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91251906 is a wasteful number, since it uses less digits than its factorization.

91251906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15208656.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 91251906 is about 9552.5863513501. The cubic root of 91251906 is about 450.2088018655.

The spelling of 91251906 in words is "ninety-one million, two hundred fifty-one thousand, nine hundred six".