31020055 has 12 divisors (see below), whose sum is σ = 40662216. Its totient is φ = 22530000.

The previous prime is 31020007. The next prime is 31020079. The reversal of 31020055 is 55002013.

It is not a de Polignac number, because 31020055 - 2⁷ = 31019927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40930 + ... + 41680.

It is an arithmetic number, because the mean of its divisors is an integer number (3388518).

Almost surely, 2^31020055 is an apocalyptic number.

31020055 is a deficient number, since it is larger than the sum of its proper divisors (9642161).

31020055 is an frugal number, since it uses more digits than its factorization.

31020055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 31020055 is about 5569.5650638088. The cubic root of 31020055 is about 314.2057929898.

Adding to 31020055 its reverse (55002013), we get a palindrome (86022068).

The spelling of 31020055 in words is "thirty-one million, twenty thousand, fifty-five".