64821031231 has 16 divisors (see below), whose sum is σ = 72637620768. Its totient is φ = 57325622400.

The previous prime is 64821031207. The next prime is 64821031243. The reversal of 64821031231 is 13213012846.

It is a cyclic number.

It is not a de Polignac number, because 64821031231 - 2¹¹ = 64821029183 is a prime.

It is a super-2 number, since 2×64821031231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64821031193 and 64821031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64821031291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3336261 + ... + 3355633.

It is an arithmetic number, because the mean of its divisors is an integer number (4539851298).

Almost surely, 2^64821031231 is an apocalyptic number.

64821031231 is a deficient number, since it is larger than the sum of its proper divisors (7816589537).

64821031231 is a wasteful number, since it uses less digits than its factorization.

64821031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27642.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 64821031231 in words is "sixty-four billion, eight hundred twenty-one million, thirty-one thousand, two hundred thirty-one".