31405049243 has 2 divisors, whose sum is σ = 31405049244. Its totient is φ = 31405049242.

The previous prime is 31405049219. The next prime is 31405049363. The reversal of 31405049243 is 34294050413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31405049243 - 2³⁴ = 14225180059 is a prime.

It is a super-4 number, since 4×31405049243⁴ (a number of 43 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (31405049443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702524621 + 15702524622.

It is an arithmetic number, because the mean of its divisors is an integer number (15702524622).

Almost surely, 2^31405049243 is an apocalyptic number.

31405049243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405049243 is an equidigital number, since it uses as much as digits as its factorization.

31405049243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 31405049243 its reverse (34294050413), we get a palindrome (65699099656).

The spelling of 31405049243 in words is "thirty-one billion, four hundred five million, forty-nine thousand, two hundred forty-three".