642041202431 has 2 divisors, whose sum is σ = 642041202432. Its totient is φ = 642041202430.

The previous prime is 642041202349. The next prime is 642041202433. The reversal of 642041202431 is 134202140246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642041202431 is a prime.

It is a super-2 number, since 2×642041202431² (a number of 24 digits) contains 22 as substring.

Together with 642041202433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 642041202394 and 642041202403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642041202433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321020601215 + 321020601216.

It is an arithmetic number, because the mean of its divisors is an integer number (321020601216).

Almost surely, 2^642041202431 is an apocalyptic number.

642041202431 is a deficient number, since it is larger than the sum of its proper divisors (1).

642041202431 is an equidigital number, since it uses as much as digits as its factorization.

642041202431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 642041202431 its reverse (134202140246), we get a palindrome (776243342677).

The spelling of 642041202431 in words is "six hundred forty-two billion, forty-one million, two hundred two thousand, four hundred thirty-one".