31320155055 has 32 divisors (see below), whose sum is σ = 57390796800. Its totient is φ = 14287871232.

The previous prime is 31320155051. The next prime is 31320155077. The reversal of 31320155055 is 55055102313.

It is not a de Polignac number, because 31320155055 - 2² = 31320155051 is a prime.

It is a super-2 number, since 2×31320155055² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320155051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261070 + ... + 361659.

It is an arithmetic number, because the mean of its divisors is an integer number (1793462400).

Almost surely, 2^31320155055 is an apocalyptic number.

31320155055 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31320155055 is a deficient number, since it is larger than the sum of its proper divisors (26070641745).

31320155055 is a wasteful number, since it uses less digits than its factorization.

31320155055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623223.

The product of its (nonzero) digits is 11250, while the sum is 30.

Adding to 31320155055 its reverse (55055102313), we get a palindrome (86375257368).

The spelling of 31320155055 in words is "thirty-one billion, three hundred twenty million, one hundred fifty-five thousand, fifty-five".