312120515430503 has 4 divisors (see below), whose sum is σ = 336129785848248. Its totient is φ = 288111245012760.

The previous prime is 312120515430469. The next prime is 312120515430533. The reversal of 312120515430503 is 305034515021213.

It is a happy number.

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

It is not a de Polignac number, because 312120515430503 - 2⁸ = 312120515430247 is a prime.

It is a super-2 number, since 2×312120515430503² (a number of 30 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 (312120515430533) 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, 12004635208853 + ... + 12004635208878.

It is an arithmetic number, because the mean of its divisors is an integer number (84032446462062).

Almost surely, 2^{312120515430503} is an apocalyptic number.

312120515430503 is a deficient number, since it is larger than the sum of its proper divisors (24009270417745).

312120515430503 is a wasteful number, since it uses less digits than its factorization.

312120515430503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24009270417744.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 312120515430503 in words is "three hundred twelve trillion, one hundred twenty billion, five hundred fifteen million, four hundred thirty thousand, five hundred three".