91081142 has 4 divisors (see below), whose sum is σ = 136621716. Its totient is φ = 45540570.

The previous prime is 91081099. The next prime is 91081147. The reversal of 91081142 is 24118019.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91081147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22770284 + ... + 22770287.

It is an arithmetic number, because the mean of its divisors is an integer number (34155429).

Almost surely, 2^91081142 is an apocalyptic number.

91081142 is a deficient number, since it is larger than the sum of its proper divisors (45540574).

91081142 is a wasteful number, since it uses less digits than its factorization.

91081142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45540573.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 91081142 is about 9543.6440629353. The cubic root of 91081142 is about 449.9277941760.

The spelling of 91081142 in words is "ninety-one million, eighty-one thousand, one hundred forty-two".