31784317853 has 2 divisors, whose sum is σ = 31784317854. Its totient is φ = 31784317852.

The previous prime is 31784317847. The next prime is 31784317889. The reversal of 31784317853 is 35871348713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18927706084 + 12856611769 = 137578^2 + 113387^2 .

It is a cyclic number.

It is not a de Polignac number, because 31784317853 - 2²⁶ = 31717208989 is a prime.

It is a super-2 number, since 2×31784317853² (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 (31784313853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15892158926 + 15892158927.

It is an arithmetic number, because the mean of its divisors is an integer number (15892158927).

Almost surely, 2^31784317853 is an apocalyptic number.

It is an amenable number.

31784317853 is a deficient number, since it is larger than the sum of its proper divisors (1).

31784317853 is an equidigital number, since it uses as much as digits as its factorization.

31784317853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 50.

The spelling of 31784317853 in words is "thirty-one billion, seven hundred eighty-four million, three hundred seventeen thousand, eight hundred fifty-three".