316117621 has 4 divisors (see below), whose sum is σ = 316177600. Its totient is φ = 316057644.

The previous prime is 316117583. The next prime is 316117643. The reversal of 316117621 is 126711613.

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: 126711613 = 7 ⋅18101659.

It is a cyclic number.

It is not a de Polignac number, because 316117621 - 2¹³ = 316109429 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 316117621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316117651) 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, 21231 + ... + 32908.

It is an arithmetic number, because the mean of its divisors is an integer number (79044400).

Almost surely, 2^316117621 is an apocalyptic number.

It is an amenable number.

316117621 is a deficient number, since it is larger than the sum of its proper divisors (59979).

316117621 is an equidigital number, since it uses as much as digits as its factorization.

316117621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59978.

The product of its digits is 1512, while the sum is 28.

The square root of 316117621 is about 17779.6968759313. The cubic root of 316117621 is about 681.2129597907.

The spelling of 316117621 in words is "three hundred sixteen million, one hundred seventeen thousand, six hundred twenty-one".