312220481 has 4 divisors (see below), whose sum is σ = 312382464. Its totient is φ = 312058500.

The previous prime is 312220477. The next prime is 312220523. The reversal of 312220481 is 184022213.

It is a happy number.

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: 184022213 = 4073 ⋅45181.

It is a cyclic number.

It is not a de Polignac number, because 312220481 - 2² = 312220477 is a prime.

It is a super-2 number, since 2×312220481² = 194963257511742722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312220421) 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, 78065 + ... + 81966.

It is an arithmetic number, because the mean of its divisors is an integer number (78095616).

Almost surely, 2^312220481 is an apocalyptic number.

It is an amenable number.

312220481 is a deficient number, since it is larger than the sum of its proper divisors (161983).

312220481 is a wasteful number, since it uses less digits than its factorization.

312220481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161982.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 312220481 is about 17669.7617697580. The cubic root of 312220481 is about 678.4020154477.

Adding to 312220481 its reverse (184022213), we get a palindrome (496242694).

The spelling of 312220481 in words is "three hundred twelve million, two hundred twenty thousand, four hundred eighty-one".