31313378 has 8 divisors (see below), whose sum is σ = 46994268. Its totient is φ = 15648624.

The previous prime is 31313377. The next prime is 31313389. The reversal of 31313378 is 87331313.

It can be written as a sum of positive squares in 2 ways, for example, as 24433249 + 6880129 = 4943^2 + 2623^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31313378.

It is not an unprimeable number, because it can be changed into a prime (31313377) 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, 4100 + ... + 8912.

Almost surely, 2^31313378 is an apocalyptic number.

31313378 is a deficient number, since it is larger than the sum of its proper divisors (15680890).

31313378 is a wasteful number, since it uses less digits than its factorization.

31313378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8068.

The product of its digits is 4536, while the sum is 29.

The square root of 31313378 is about 5595.8357731442. The cubic root of 31313378 is about 315.1930554204.

The spelling of 31313378 in words is "thirty-one million, three hundred thirteen thousand, three hundred seventy-eight".