402144042431 has 4 divisors (see below), whose sum is σ = 402185141832. Its totient is φ = 402102943032.

The previous prime is 402144042407. The next prime is 402144042491. The reversal of 402144042431 is 134240441204.

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 402144042431 - 2²⁶ = 402076933567 is a prime.

It is a super-2 number, since 2×402144042431² (a number of 24 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 = 402144042394 and 402144042403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402144042491) 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, 20535020 + ... + 20554593.

It is an arithmetic number, because the mean of its divisors is an integer number (100546285458).

Almost surely, 2^402144042431 is an apocalyptic number.

402144042431 is a deficient number, since it is larger than the sum of its proper divisors (41099401).

402144042431 is an equidigital number, since it uses as much as digits as its factorization.

402144042431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41099400.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 402144042431 its reverse (134240441204), we get a palindrome (536384483635).

The spelling of 402144042431 in words is "four hundred two billion, one hundred forty-four million, forty-two thousand, four hundred thirty-one".