31049137687 has 2 divisors, whose sum is σ = 31049137688. Its totient is φ = 31049137686.

The previous prime is 31049137643. The next prime is 31049137723. The reversal of 31049137687 is 78673194013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31049137687 is a prime.

It is a super-2 number, since 2×31049137687² (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 31049137687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31049137627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15524568843 + 15524568844.

It is an arithmetic number, because the mean of its divisors is an integer number (15524568844).

Almost surely, 2^31049137687 is an apocalyptic number.

31049137687 is a deficient number, since it is larger than the sum of its proper divisors (1).

31049137687 is an equidigital number, since it uses as much as digits as its factorization.

31049137687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 31049137687 in words is "thirty-one billion, forty-nine million, one hundred thirty-seven thousand, six hundred eighty-seven".