64135231 has 4 divisors (see below), whose sum is σ = 65626792. Its totient is φ = 62643672.

The previous prime is 64135219. The next prime is 64135243. The reversal of 64135231 is 13253146.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64135219) and next prime (64135243).

It is a cyclic number.

It is not a de Polignac number, because 64135231 - 2⁵ = 64135199 is a prime.

It is a super-2 number, since 2×64135231² = 8226655710846722, 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 = 64135196 and 64135205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64135031) 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, 745716 + ... + 745801.

It is an arithmetic number, because the mean of its divisors is an integer number (16406698).

Almost surely, 2^64135231 is an apocalyptic number.

64135231 is a deficient number, since it is larger than the sum of its proper divisors (1491561).

64135231 is a wasteful number, since it uses less digits than its factorization.

64135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491560.

The product of its digits is 2160, while the sum is 25.

The square root of 64135231 is about 8008.4474775077. The cubic root of 64135231 is about 400.2815330514.

Adding to 64135231 its reverse (13253146), we get a palindrome (77388377).

The spelling of 64135231 in words is "sixty-four million, one hundred thirty-five thousand, two hundred thirty-one".