75444121 has 4 divisors (see below), whose sum is σ = 75710992. Its totient is φ = 75177252.

The previous prime is 75444091. The next prime is 75444137. The reversal of 75444121 is 12144457.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 75444121 - 2²⁵ = 41889689 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 75444121.

It is not an unprimeable number, because it can be changed into a prime (75444151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133011 + ... + 133576.

It is an arithmetic number, because the mean of its divisors is an integer number (18927748).

Almost surely, 2^75444121 is an apocalyptic number.

It is an amenable number.

75444121 is a deficient number, since it is larger than the sum of its proper divisors (266871).

75444121 is a wasteful number, since it uses less digits than its factorization.

75444121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266870.

The product of its digits is 4480, while the sum is 28.

The square root of 75444121 is about 8685.8575281891. The cubic root of 75444121 is about 422.5471086438.

Adding to 75444121 its reverse (12144457), we get a palindrome (87588578).

The spelling of 75444121 in words is "seventy-five million, four hundred forty-four thousand, one hundred twenty-one".