91022012 has 12 divisors (see below), whose sum is σ = 168658560. Its totient is φ = 42833856.

The previous prime is 91021999. The next prime is 91022023. The reversal of 91022012 is 21022019.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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, 669212 + ... + 669347.

It is an arithmetic number, because the mean of its divisors is an integer number (14054880).

Almost surely, 2^91022012 is an apocalyptic number.

It is an amenable number.

91022012 is a deficient number, since it is larger than the sum of its proper divisors (77636548).

91022012 is a wasteful number, since it uses less digits than its factorization.

91022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338580 (or 1338578 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 91022012 is about 9540.5456866995. The cubic root of 91022012 is about 449.8304085221.

It can be divided in two parts, 910 and 22012, that added together give a palindrome (22922).

The spelling of 91022012 in words is "ninety-one million, twenty-two thousand, twelve".