31120868 has 6 divisors (see below), whose sum is σ = 54461526.
Its totient is φ = 15560432.
The previous prime is 31120867. The next prime is 31120877. The reversal of 31120868 is 86802113.
It can be written as a sum of positive squares in only one way, i.e., 29138404 + 1982464 = 5398^2 + 1408^2
It is a self number, because there is not a number n which added to its sum of digits gives 31120868.
It is not an unprimeable number, because it can be changed into a prime (31120861) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890105 + ... + 3890112.
It is an arithmetic number, because the mean of its divisors is an integer number (9076921).
Almost surely, 231120868 is an apocalyptic number.
It is an amenable number.
31120868 is a deficient number, since it is larger than the sum of its proper divisors (23340658).
31120868 is a wasteful number, since it uses less digits than its factorization.
31120868 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7780221 (or 7780219 counting only the distinct ones).
The product of its (nonzero) digits is 2304, while the sum is 29.
The square root of 31120868 is about 5578.6080701193.
The cubic root of 31120868 is about 314.5458071675.
The spelling of 31120868 in words is "thirty-one million, one hundred twenty thousand, eight hundred sixty-eight".