31442240143 has 2 divisors, whose sum is σ = 31442240144. Its totient is φ = 31442240142.

The previous prime is 31442240113. The next prime is 31442240149. The reversal of 31442240143 is 34104224413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31442240143 is a prime.

It is a super-2 number, since 2×31442240143² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31442240149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721120071 + 15721120072.

It is an arithmetic number, because the mean of its divisors is an integer number (15721120072).

Almost surely, 2^31442240143 is an apocalyptic number.

31442240143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442240143 is an equidigital number, since it uses as much as digits as its factorization.

31442240143 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 28.

Adding to 31442240143 its reverse (34104224413), we get a palindrome (65546464556).

The spelling of 31442240143 in words is "thirty-one billion, four hundred forty-two million, two hundred forty thousand, one hundred forty-three".