64115231 has 4 divisors (see below), whose sum is σ = 64137192. Its totient is φ = 64093272.

The previous prime is 64115221. The next prime is 64115257. The reversal of 64115231 is 13251146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13251146 = 2 ⋅6625573.

It is a cyclic number.

It is not a de Polignac number, because 64115231 - 2¹⁴ = 64098847 is a prime.

It is a super-2 number, since 2×64115231² = 8221525692366722, 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 = 64115197 and 64115206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64115221) 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, 5780 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (16034298).

Almost surely, 2^64115231 is an apocalyptic number.

64115231 is a deficient number, since it is larger than the sum of its proper divisors (21961).

64115231 is a wasteful number, since it uses less digits than its factorization.

64115231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21960.

The product of its digits is 720, while the sum is 23.

The square root of 64115231 is about 8007.1986986711. The cubic root of 64115231 is about 400.2399206498.

Adding to 64115231 its reverse (13251146), we get a palindrome (77366377).

It can be divided in two parts, 64115 and 231, that added together give a palindrome (64346).

The spelling of 64115231 in words is "sixty-four million, one hundred fifteen thousand, two hundred thirty-one".