31878745253 has 6 divisors (see below), whose sum is σ = 33864272946. Its totient is φ = 30003524672.

The previous prime is 31878745237. The next prime is 31878745273. The reversal of 31878745253 is 35254787813.

It can be written as a sum of positive squares in 3 ways, for example, as 18635799169 + 13242946084 = 136513^2 + 115078^2 .

It is not a de Polignac number, because 31878745253 - 2⁴ = 31878745237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31878745195 and 31878745204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31878745273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55153250 + ... + 55153827.

It is an arithmetic number, because the mean of its divisors is an integer number (5644045491).

Almost surely, 2^31878745253 is an apocalyptic number.

It is an amenable number.

31878745253 is a deficient number, since it is larger than the sum of its proper divisors (1985527693).

31878745253 is a wasteful number, since it uses less digits than its factorization.

31878745253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110307111 (or 110307094 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 53.

The spelling of 31878745253 in words is "thirty-one billion, eight hundred seventy-eight million, seven hundred forty-five thousand, two hundred fifty-three".