31220055 has 12 divisors (see below), whose sum is σ = 54114840. Its totient is φ = 16650672.

The previous prime is 31220053. The next prime is 31220081. The reversal of 31220055 is 55002213.

It is a happy number.

It is not a de Polignac number, because 31220055 - 2¹ = 31220053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220053) 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, 346845 + ... + 346934.

It is an arithmetic number, because the mean of its divisors is an integer number (4509570).

Almost surely, 2^31220055 is an apocalyptic number.

31220055 is a deficient number, since it is larger than the sum of its proper divisors (22894785).

31220055 is a wasteful number, since it uses less digits than its factorization.

31220055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693790 (or 693787 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 31220055 is about 5587.4909395900. The cubic root of 31220055 is about 314.8796214252.

Adding to 31220055 its reverse (55002213), we get a palindrome (86222268).

The spelling of 31220055 in words is "thirty-one million, two hundred twenty thousand, fifty-five".