75520231 has 4 divisors (see below), whose sum is σ = 79495000. Its totient is φ = 71545464.

The previous prime is 75520217. The next prime is 75520253. The reversal of 75520231 is 13202557.

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 75520231 - 2⁵ = 75520199 is a prime.

It is a super-2 number, since 2×75520231² = 11406610580586722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75520196 and 75520205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75520261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987356 + ... + 1987393.

It is an arithmetic number, because the mean of its divisors is an integer number (19873750).

Almost surely, 2^75520231 is an apocalyptic number.

75520231 is a deficient number, since it is larger than the sum of its proper divisors (3974769).

75520231 is a wasteful number, since it uses less digits than its factorization.

75520231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974768.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 75520231 is about 8690.2376837461. The cubic root of 75520231 is about 422.6891530754.

Adding to 75520231 its reverse (13202557), we get a palindrome (88722788).

The spelling of 75520231 in words is "seventy-five million, five hundred twenty thousand, two hundred thirty-one".