75513231 has 6 divisors (see below), whose sum is σ = 109074680. Its totient is φ = 50342148.

The previous prime is 75513227. The next prime is 75513271. The reversal of 75513231 is 13231557.

It is not a de Polignac number, because 75513231 - 2² = 75513227 is a prime.

It is a super-2 number, since 2×75513231² = 11404496112118722, 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 = 75513195 and 75513204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75513211) 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, 4195171 + ... + 4195188.

Almost surely, 2^75513231 is an apocalyptic number.

75513231 is a deficient number, since it is larger than the sum of its proper divisors (33561449).

75513231 is a wasteful number, since it uses less digits than its factorization.

75513231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8390365 (or 8390362 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 75513231 is about 8689.8349236335. The cubic root of 75513231 is about 422.6760929304.

Adding to 75513231 its reverse (13231557), we get a palindrome (88744788).

The spelling of 75513231 in words is "seventy-five million, five hundred thirteen thousand, two hundred thirty-one".