318701621 has 4 divisors (see below), whose sum is σ = 364230432. Its totient is φ = 273172812.

The previous prime is 318701597. The next prime is 318701627. The reversal of 318701621 is 126107813.

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: 126107813 = 13 ⋅9700601.

It is a cyclic number.

It is not a de Polignac number, because 318701621 - 2⁶ = 318701557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318701627) 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, 22764395 + ... + 22764408.

It is an arithmetic number, because the mean of its divisors is an integer number (91057608).

Almost surely, 2^318701621 is an apocalyptic number.

It is an amenable number.

318701621 is a deficient number, since it is larger than the sum of its proper divisors (45528811).

318701621 is an equidigital number, since it uses as much as digits as its factorization.

318701621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45528810.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 318701621 is about 17852.2161369394. The cubic root of 318701621 is about 683.0640426647.

The spelling of 318701621 in words is "three hundred eighteen million, seven hundred one thousand, six hundred twenty-one".