56402321231 has 4 divisors (see below), whose sum is σ = 56402866152. Its totient is φ = 56401776312.

The previous prime is 56402321221. The next prime is 56402321249. The reversal of 56402321231 is 13212320465.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56402321231 is a prime.

It is a super-2 number, since 2×56402321231² (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 = 56402321194 and 56402321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56402321221) 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, 64076 + ... + 341921.

It is an arithmetic number, because the mean of its divisors is an integer number (14100716538).

Almost surely, 2^56402321231 is an apocalyptic number.

56402321231 is a deficient number, since it is larger than the sum of its proper divisors (544921).

56402321231 is a wasteful number, since it uses less digits than its factorization.

56402321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544920.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 56402321231 its reverse (13212320465), we get a palindrome (69614641696).

The spelling of 56402321231 in words is "fifty-six billion, four hundred two million, three hundred twenty-one thousand, two hundred thirty-one".