91191742 has 8 divisors (see below), whose sum is σ = 136829232. Its totient is φ = 45582000.

The previous prime is 91191679. The next prime is 91191743. The reversal of 91191742 is 24719119.

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

It is a junction number, because it is equal to n+sod(n) for n = 91191698 and 91191707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91191743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6442 + ... + 14962.

It is an arithmetic number, because the mean of its divisors is an integer number (17103654).

Almost surely, 2^91191742 is an apocalyptic number.

91191742 is a deficient number, since it is larger than the sum of its proper divisors (45637490).

91191742 is a wasteful number, since it uses less digits than its factorization.

91191742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13874.

The product of its digits is 4536, while the sum is 34.

The square root of 91191742 is about 9549.4367373160. The cubic root of 91191742 is about 450.1098365633.

The spelling of 91191742 in words is "ninety-one million, one hundred ninety-one thousand, seven hundred forty-two".