91861266 has 32 divisors (see below), whose sum is σ = 210430080. Its totient is φ = 26188416.

The previous prime is 91861249. The next prime is 91861267. The reversal of 91861266 is 66216819.

It is a super-2 number, since 2×91861266² = 16876984382245512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91861267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19230 + ... + 23526.

It is an arithmetic number, because the mean of its divisors is an integer number (6575940).

Almost surely, 2^91861266 is an apocalyptic number.

91861266 is an abundant number, since it is smaller than the sum of its proper divisors (118568814).

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

91861266 is a wasteful number, since it uses less digits than its factorization.

91861266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818.

The product of its digits is 31104, while the sum is 39.

The square root of 91861266 is about 9584.4283084595. The cubic root of 91861266 is about 451.2087109599.

The spelling of 91861266 in words is "ninety-one million, eight hundred sixty-one thousand, two hundred sixty-six".