31607378247 has 4 divisors (see below), whose sum is σ = 42143171000. Its totient is φ = 21071585496.

The previous prime is 31607378221. The next prime is 31607378249. The reversal of 31607378247 is 74287370613.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31607378247 - 2⁷ = 31607378119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31607378196 and 31607378205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31607378249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5267896372 + ... + 5267896377.

It is an arithmetic number, because the mean of its divisors is an integer number (10535792750).

Almost surely, 2^31607378247 is an apocalyptic number.

31607378247 is a deficient number, since it is larger than the sum of its proper divisors (10535792753).

31607378247 is a wasteful number, since it uses less digits than its factorization.

31607378247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10535792752.

The product of its (nonzero) digits is 1185408, while the sum is 48.

The spelling of 31607378247 in words is "thirty-one billion, six hundred seven million, three hundred seventy-eight thousand, two hundred forty-seven".