91139742 has 20 divisors (see below), whose sum is σ = 204220896. Its totient is φ = 30379860.

The previous prime is 91139729. The next prime is 91139743. The reversal of 91139742 is 24793119.

It is a junction number, because it is equal to n+sod(n) for n = 91139697 and 91139706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91139743) 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 9 ways as a sum of consecutive naturals, for example, 281134 + ... + 281457.

Almost surely, 2^91139742 is an apocalyptic number.

91139742 is an abundant number, since it is smaller than the sum of its proper divisors (113081154).

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

91139742 is a wasteful number, since it uses less digits than its factorization.

91139742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562605 (or 562596 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 91139742 is about 9546.7136753964. The cubic root of 91139742 is about 450.0242653582.

The spelling of 91139742 in words is "ninety-one million, one hundred thirty-nine thousand, seven hundred forty-two".