312290329 has 4 divisors (see below), whose sum is σ = 336312676. Its totient is φ = 288267984.

The previous prime is 312290291. The next prime is 312290347. The reversal of 312290329 is 923092213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923092213 = 9349 ⋅98737.

It can be written as a sum of positive squares in 2 ways, for example, as 57153600 + 255136729 = 7560^2 + 15973^2 .

It is a cyclic number.

It is not a de Polignac number, because 312290329 - 2¹¹ = 312288281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312290329.

It is not an unprimeable number, because it can be changed into a prime (312290359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12011154 + ... + 12011179.

It is an arithmetic number, because the mean of its divisors is an integer number (84078169).

Almost surely, 2^312290329 is an apocalyptic number.

It is an amenable number.

312290329 is a deficient number, since it is larger than the sum of its proper divisors (24022347).

312290329 is a wasteful number, since it uses less digits than its factorization.

312290329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24022346.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 312290329 is about 17671.7381431482. The cubic root of 312290329 is about 678.4526009514.

The spelling of 312290329 in words is "three hundred twelve million, two hundred ninety thousand, three hundred twenty-nine".