312155131 has 2 divisors, whose sum is σ = 312155132. Its totient is φ = 312155130.

The previous prime is 312155119. The next prime is 312155143. The reversal of 312155131 is 131551213.

It is a balanced prime because it is at equal distance from previous prime (312155119) and next prime (312155143).

It is a cyclic number.

It is not a de Polignac number, because 312155131 - 2¹⁹ = 311630843 is a prime.

It is a super-2 number, since 2×312155131² = 194881651619254322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312155111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156077565 + 156077566.

It is an arithmetic number, because the mean of its divisors is an integer number (156077566).

Almost surely, 2^312155131 is an apocalyptic number.

312155131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312155131 is an equidigital number, since it uses as much as digits as its factorization.

312155131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 22.

The square root of 312155131 is about 17667.9124686534. The cubic root of 312155131 is about 678.3546806658.

The spelling of 312155131 in words is "three hundred twelve million, one hundred fifty-five thousand, one hundred thirty-one".