312155112205 has 4 divisors (see below), whose sum is σ = 374586134652. Its totient is φ = 249724089760.

The previous prime is 312155112149. The next prime is 312155112209. The reversal of 312155112205 is 502211551213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243165361924 + 68989750281 = 493118^2 + 262659^2 .

It is not a de Polignac number, because 312155112205 - 2⁷ = 312155112077 is a prime.

It is a super-2 number, since 2×312155112205² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312155112209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31215511216 + ... + 31215511225.

It is an arithmetic number, because the mean of its divisors is an integer number (93646533663).

Almost surely, 2^312155112205 is an apocalyptic number.

It is an amenable number.

312155112205 is a deficient number, since it is larger than the sum of its proper divisors (62431022447).

312155112205 is an equidigital number, since it uses as much as digits as its factorization.

312155112205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62431022446.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 312155112205 its reverse (502211551213), we get a palindrome (814366663418).

It can be divided in two parts, 3121551 and 12205, that added together give a triangular number (3133756 = T₂₅₀₃).

The spelling of 312155112205 in words is "three hundred twelve billion, one hundred fifty-five million, one hundred twelve thousand, two hundred five".