31134978 has 48 divisors (see below), whose sum is σ = 77837760. Its totient is φ = 8810208.

The previous prime is 31134937. The next prime is 31134997. The reversal of 31134978 is 87943113.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12601 + ... + 14867.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^31134978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31134978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38918880).

31134978 is an abundant number, since it is smaller than the sum of its proper divisors (46702782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31134978 is a wasteful number, since it uses less digits than its factorization.

31134978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391 (or 2388 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31134978 is about 5579.8725791903. The cubic root of 31134978 is about 314.5933376621.

The spelling of 31134978 in words is "thirty-one million, one hundred thirty-four thousand, nine hundred seventy-eight".