91043542 has 4 divisors (see below), whose sum is σ = 136565316. Its totient is φ = 45521770.

The previous prime is 91043539. The next prime is 91043581. The reversal of 91043542 is 24534019.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91043542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22760884 + ... + 22760887.

It is an arithmetic number, because the mean of its divisors is an integer number (34141329).

Almost surely, 2^91043542 is an apocalyptic number.

91043542 is a deficient number, since it is larger than the sum of its proper divisors (45521774).

91043542 is a wasteful number, since it uses less digits than its factorization.

91043542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45521773.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 91043542 is about 9541.6739621515. The cubic root of 91043542 is about 449.8658727832.

The spelling of 91043542 in words is "ninety-one million, forty-three thousand, five hundred forty-two".