312481621 has 4 divisors (see below), whose sum is σ = 312538144. Its totient is φ = 312425100.

The previous prime is 312481529. The next prime is 312481627. The reversal of 312481621 is 126184213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126184213 = 197 ⋅640529.

It is a cyclic number.

It is not a de Polignac number, because 312481621 - 2⁷ = 312481493 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 312481621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312481627) 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, 18945 + ... + 31366.

It is an arithmetic number, because the mean of its divisors is an integer number (78134536).

Almost surely, 2^312481621 is an apocalyptic number.

It is an amenable number.

312481621 is a deficient number, since it is larger than the sum of its proper divisors (56523).

312481621 is an equidigital number, since it uses as much as digits as its factorization.

312481621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56522.

The product of its digits is 2304, while the sum is 28.

The square root of 312481621 is about 17677.1496853989. The cubic root of 312481621 is about 678.5911003462.

The spelling of 312481621 in words is "three hundred twelve million, four hundred eighty-one thousand, six hundred twenty-one".