91121142 has 32 divisors (see below), whose sum is σ = 208560384. Its totient is φ = 25999200.

The previous prime is 91121141. The next prime is 91121143. The reversal of 91121142 is 24112119.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91121141) and next prime (91121143).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91121141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 57217 + ... + 58787.

It is an arithmetic number, because the mean of its divisors is an integer number (6517512).

Almost surely, 2^91121142 is an apocalyptic number.

91121142 is an abundant number, since it is smaller than the sum of its proper divisors (117439242).

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

91121142 is a wasteful number, since it uses less digits than its factorization.

91121142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964.

The product of its digits is 144, while the sum is 21.

The square root of 91121142 is about 9545.7394684749. The cubic root of 91121142 is about 449.9936492931.

The spelling of 91121142 in words is "ninety-one million, one hundred twenty-one thousand, one hundred forty-two".