42015323431 has 2 divisors, whose sum is σ = 42015323432. Its totient is φ = 42015323430.

The previous prime is 42015323407. The next prime is 42015323461. The reversal of 42015323431 is 13432351024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42015323431 - 2²⁵ = 41981768999 is a prime.

It is a super-2 number, since 2×42015323431² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42015323431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42015323461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21007661715 + 21007661716.

It is an arithmetic number, because the mean of its divisors is an integer number (21007661716).

Almost surely, 2^42015323431 is an apocalyptic number.

42015323431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42015323431 is an equidigital number, since it uses as much as digits as its factorization.

42015323431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 42015323431 its reverse (13432351024), we get a palindrome (55447674455).

The spelling of 42015323431 in words is "forty-two billion, fifteen million, three hundred twenty-three thousand, four hundred thirty-one".