75042991 has 4 divisors (see below), whose sum is σ = 75105184. Its totient is φ = 74980800.

The previous prime is 75042977. The next prime is 75043057. The reversal of 75042991 is 19924057.

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

It is a cyclic number.

It is not a de Polignac number, because 75042991 - 2¹¹ = 75040943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75042991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75042391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29250 + ... + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (18776296).

Almost surely, 2^75042991 is an apocalyptic number.

75042991 is a deficient number, since it is larger than the sum of its proper divisors (62193).

75042991 is a wasteful number, since it uses less digits than its factorization.

75042991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62192.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 75042991 is about 8662.7357687973. The cubic root of 75042991 is about 421.7968950679.

The spelling of 75042991 in words is "seventy-five million, forty-two thousand, nine hundred ninety-one".