91022290 has 8 divisors (see below), whose sum is σ = 163840140. Its totient is φ = 36408912.

The previous prime is 91022273. The next prime is 91022333. The reversal of 91022290 is 9222019.

It can be written as a sum of positive squares in 2 ways, for example, as 90839961 + 182329 = 9531^2 + 427^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4551105 + ... + 4551124.

Almost surely, 2^91022290 is an apocalyptic number.

91022290 is a deficient number, since it is larger than the sum of its proper divisors (72817850).

91022290 is a wasteful number, since it uses less digits than its factorization.

91022290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9102236.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 91022290 is about 9540.5602560856. The cubic root of 91022290 is about 449.8308664799.

The spelling of 91022290 in words is "ninety-one million, twenty-two thousand, two hundred ninety".