64555231 has 4 divisors (see below), whose sum is σ = 69521032. Its totient is φ = 59589432.

The previous prime is 64555223. The next prime is 64555241. The reversal of 64555231 is 13255546.

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 64555231 - 2³ = 64555223 is a prime.

It is a super-2 number, since 2×64555231² = 8334755698926722, 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 = 64555193 and 64555202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64555201) 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, 2482881 + ... + 2482906.

It is an arithmetic number, because the mean of its divisors is an integer number (17380258).

Almost surely, 2^64555231 is an apocalyptic number.

64555231 is a deficient number, since it is larger than the sum of its proper divisors (4965801).

64555231 is a wasteful number, since it uses less digits than its factorization.

64555231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965800.

The product of its digits is 18000, while the sum is 31.

The square root of 64555231 is about 8034.6269981873. The cubic root of 64555231 is about 401.1534022117.

The spelling of 64555231 in words is "sixty-four million, five hundred fifty-five thousand, two hundred thirty-one".