31378461693 has 16 divisors (see below), whose sum is σ = 42430941696. Its totient is φ = 20622746880.

The previous prime is 31378461659. The next prime is 31378461703. The reversal of 31378461693 is 39616487313.

It is not a de Polignac number, because 31378461693 - 2⁹ = 31378461181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31378461193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450873 + ... + 515793.

It is an arithmetic number, because the mean of its divisors is an integer number (2651933856).

Almost surely, 2^31378461693 is an apocalyptic number.

It is an amenable number.

31378461693 is a deficient number, since it is larger than the sum of its proper divisors (11052480003).

31378461693 is a wasteful number, since it uses less digits than its factorization.

31378461693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67204.

The product of its digits is 1959552, while the sum is 51.

The spelling of 31378461693 in words is "thirty-one billion, three hundred seventy-eight million, four hundred sixty-one thousand, six hundred ninety-three".