75605121 has 6 divisors (see below), whose sum is σ = 109207410. Its totient is φ = 50403408.

The previous prime is 75605119. The next prime is 75605129. The reversal of 75605121 is 12150657.

It can be written as a sum of positive squares in only one way, i.e., 75064896 + 540225 = 8664^2 + 735^2 .

It is not a de Polignac number, because 75605121 - 2¹ = 75605119 is a prime.

It is a super-2 number, since 2×75605121² = 11432268642849282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (75605129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4200276 + ... + 4200293.

It is an arithmetic number, because the mean of its divisors is an integer number (18201235).

Almost surely, 2^75605121 is an apocalyptic number.

It is an amenable number.

75605121 is a deficient number, since it is larger than the sum of its proper divisors (33602289).

75605121 is a wasteful number, since it uses less digits than its factorization.

75605121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400575 (or 8400572 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 75605121 is about 8695.1205282043. The cubic root of 75605121 is about 422.8474711202.

Adding to 75605121 its reverse (12150657), we get a palindrome (87755778).

The spelling of 75605121 in words is "seventy-five million, six hundred five thousand, one hundred twenty-one".