31140765 has 12 divisors (see below), whose sum is σ = 53977404. Its totient is φ = 16608384.

The previous prime is 31140763. The next prime is 31140779. The reversal of 31140765 is 56704113.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 18481401 = 3558^2 + 4299^2 .

It is not a de Polignac number, because 31140765 - 2¹ = 31140763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345964 + ... + 346053.

It is an arithmetic number, because the mean of its divisors is an integer number (4498117).

Almost surely, 2^31140765 is an apocalyptic number.

It is an amenable number.

31140765 is a deficient number, since it is larger than the sum of its proper divisors (22836639).

31140765 is a wasteful number, since it uses less digits than its factorization.

31140765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692028 (or 692025 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 31140765 is about 5580.3911153252. The cubic root of 31140765 is about 314.6128274127.

Adding to 31140765 its reverse (56704113), we get a palindrome (87844878).

The spelling of 31140765 in words is "thirty-one million, one hundred forty thousand, seven hundred sixty-five".