312121131 has 24 divisors (see below), whose sum is σ = 489566160. Its totient is φ = 176343552.

The previous prime is 312121129. The next prime is 312121217. The reversal of 312121131 is 131121213.

It is a happy number.

It is not a de Polignac number, because 312121131 - 2¹ = 312121129 is a prime.

It is a super-2 number, since 2×312121131² = 194839200833438322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312121131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1155 + ... + 25011.

It is an arithmetic number, because the mean of its divisors is an integer number (20398590).

Almost surely, 2^312121131 is an apocalyptic number.

312121131 is a deficient number, since it is larger than the sum of its proper divisors (177445029).

312121131 is a wasteful number, since it uses less digits than its factorization.

312121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23963 (or 23956 counting only the distinct ones).

The product of its digits is 36, while the sum is 15.

The square root of 312121131 is about 17666.9502461517. The cubic root of 312121131 is about 678.3300509285.

Adding to 312121131 its reverse (131121213), we get a palindrome (443242344).

The spelling of 312121131 in words is "three hundred twelve million, one hundred twenty-one thousand, one hundred thirty-one".