75111691 has 4 divisors (see below), whose sum is σ = 75255832. Its totient is φ = 74967552.

The previous prime is 75111689. The next prime is 75111709. The reversal of 75111691 is 19611157.

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 75111691 - 2¹ = 75111689 is a prime.

It is a super-2 number, since 2×75111691² = 11283532249758962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75112691) 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, 71286 + ... + 72331.

It is an arithmetic number, because the mean of its divisors is an integer number (18813958).

Almost surely, 2^75111691 is an apocalyptic number.

75111691 is a deficient number, since it is larger than the sum of its proper divisors (144141).

75111691 is a wasteful number, since it uses less digits than its factorization.

75111691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144140.

The product of its digits is 1890, while the sum is 31.

The square root of 75111691 is about 8666.7001217303. The cubic root of 75111691 is about 421.9255706804.

The spelling of 75111691 in words is "seventy-five million, one hundred eleven thousand, six hundred ninety-one".