75525221 has 4 divisors (see below), whose sum is σ = 75575712. Its totient is φ = 75474732.

The previous prime is 75525211. The next prime is 75525227. The reversal of 75525221 is 12252557.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12252557 = 977 ⋅12541.

It is a cyclic number.

It is not a de Polignac number, because 75525221 - 2¹⁸ = 75263077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75525227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22931 + ... + 26016.

It is an arithmetic number, because the mean of its divisors is an integer number (18893928).

Almost surely, 2^75525221 is an apocalyptic number.

It is an amenable number.

75525221 is a deficient number, since it is larger than the sum of its proper divisors (50491).

75525221 is a wasteful number, since it uses less digits than its factorization.

75525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50490.

The product of its digits is 7000, while the sum is 29.

The square root of 75525221 is about 8690.5247827735. The cubic root of 75525221 is about 422.6984626003.

Adding to 75525221 its reverse (12252557), we get a palindrome (87777778).

The spelling of 75525221 in words is "seventy-five million, five hundred twenty-five thousand, two hundred twenty-one".