31481781127 has 2 divisors, whose sum is σ = 31481781128. Its totient is φ = 31481781126.

The previous prime is 31481781119. The next prime is 31481781193. The reversal of 31481781127 is 72118718413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31481781127 - 2³ = 31481781119 is a prime.

It is a super-2 number, since 2×31481781127² (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 (31481781197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740890563 + 15740890564.

It is an arithmetic number, because the mean of its divisors is an integer number (15740890564).

Almost surely, 2^31481781127 is an apocalyptic number.

31481781127 is a deficient number, since it is larger than the sum of its proper divisors (1).

31481781127 is an equidigital number, since it uses as much as digits as its factorization.

31481781127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 43.

The spelling of 31481781127 in words is "thirty-one billion, four hundred eighty-one million, seven hundred eighty-one thousand, one hundred twenty-seven".