312155231 has 4 divisors (see below), whose sum is σ = 314024592. Its totient is φ = 310285872.

The previous prime is 312155197. The next prime is 312155243. The reversal of 312155231 is 132551213.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 312155231 - 2¹⁰ = 312154207 is a prime.

It is a super-2 number, since 2×312155231² = 194881776481326722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312155197 and 312155206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312155251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 934430 + ... + 934763.

It is an arithmetic number, because the mean of its divisors is an integer number (78506148).

Almost surely, 2^312155231 is an apocalyptic number.

312155231 is a deficient number, since it is larger than the sum of its proper divisors (1869361).

312155231 is a wasteful number, since it uses less digits than its factorization.

312155231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869360.

The product of its digits is 900, while the sum is 23.

The square root of 312155231 is about 17667.9152986423. The cubic root of 312155231 is about 678.3547531035.

The spelling of 312155231 in words is "three hundred twelve million, one hundred fifty-five thousand, two hundred thirty-one".