991575542 has 8 divisors (see below), whose sum is σ = 1487518032. Its totient is φ = 495736200.

The previous prime is 991575539. The next prime is 991575547. The reversal of 991575542 is 245575199.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991575547) 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, 6167 + ... + 44957.

It is an arithmetic number, because the mean of its divisors is an integer number (185939754).

Almost surely, 2^991575542 is an apocalyptic number.

991575542 is a deficient number, since it is larger than the sum of its proper divisors (495942490).

991575542 is a wasteful number, since it uses less digits than its factorization.

991575542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51574.

The product of its digits is 567000, while the sum is 47.

The square root of 991575542 is about 31489.2924976094. The cubic root of 991575542 is about 997.1839244962.

The spelling of 991575542 in words is "nine hundred ninety-one million, five hundred seventy-five thousand, five hundred forty-two".