31587277489 has 2 divisors, whose sum is σ = 31587277490. Its totient is φ = 31587277488.

The previous prime is 31587277483. The next prime is 31587277517. The reversal of 31587277489 is 98477278513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27964200625 + 3623076864 = 167225^2 + 60192^2 .

It is a cyclic number.

It is not a de Polignac number, because 31587277489 - 2¹¹ = 31587275441 is a prime.

It is a super-2 number, since 2×31587277489² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31587277483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15793638744 + 15793638745.

It is an arithmetic number, because the mean of its divisors is an integer number (15793638745).

Almost surely, 2^31587277489 is an apocalyptic number.

It is an amenable number.

31587277489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31587277489 is an equidigital number, since it uses as much as digits as its factorization.

31587277489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23708160, while the sum is 61.

The spelling of 31587277489 in words is "thirty-one billion, five hundred eighty-seven million, two hundred seventy-seven thousand, four hundred eighty-nine".