75424121 has 8 divisors (see below), whose sum is σ = 81171144. Its totient is φ = 69822720.

The previous prime is 75424109. The next prime is 75424123. The reversal of 75424121 is 12142457.

It can be written as a sum of positive squares in 4 ways, for example, as 16687225 + 58736896 = 4085^2 + 7664^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 75424121 - 2⁶ = 75424057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75424123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35330 + ... + 37403.

It is an arithmetic number, because the mean of its divisors is an integer number (10146393).

Almost surely, 2^75424121 is an apocalyptic number.

It is an amenable number.

75424121 is a deficient number, since it is larger than the sum of its proper divisors (5747023).

75424121 is a wasteful number, since it uses less digits than its factorization.

75424121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72811.

The product of its digits is 2240, while the sum is 26.

The square root of 75424121 is about 8684.7061550751. The cubic root of 75424121 is about 422.5097667058.

Adding to 75424121 its reverse (12142457), we get a palindrome (87566578).

The spelling of 75424121 in words is "seventy-five million, four hundred twenty-four thousand, one hundred twenty-one".