91009010 has 8 divisors (see below), whose sum is σ = 163816236. Its totient is φ = 36403600.

The previous prime is 91009001. The next prime is 91009063. The reversal of 91009010 is 1090019.

It can be written as a sum of positive squares in 2 ways, for example, as 87815641 + 3193369 = 9371^2 + 1787^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4550441 + ... + 4550460.

Almost surely, 2^91009010 is an apocalyptic number.

91009010 is a deficient number, since it is larger than the sum of its proper divisors (72807226).

91009010 is a wasteful number, since it uses less digits than its factorization.

91009010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100908.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 91009010 is about 9539.8642547994. The cubic root of 91009010 is about 449.8089888920.

Adding to 91009010 its reverse (1090019), we get a palindrome (92099029).

The spelling of 91009010 in words is "ninety-one million, nine thousand, ten".