621316001 has 4 divisors (see below), whose sum is σ = 621365892. Its totient is φ = 621266112.

The previous prime is 621315931. The next prime is 621316019. The reversal of 621316001 is 100613126.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 325441600 + 295874401 = 18040^2 + 17201^2 .

It is a cyclic number.

It is not a de Polignac number, because 621316001 - 2¹⁸ = 621053857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621316081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11021 + ... + 36933.

It is an arithmetic number, because the mean of its divisors is an integer number (155341473).

Almost surely, 2^621316001 is an apocalyptic number.

It is an amenable number.

621316001 is a deficient number, since it is larger than the sum of its proper divisors (49891).

621316001 is a wasteful number, since it uses less digits than its factorization.

621316001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49890.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 621316001 is about 24926.2111240357. The cubic root of 621316001 is about 853.3047819461.

Adding to 621316001 its reverse (100613126), we get a palindrome (721929127).

The spelling of 621316001 in words is "six hundred twenty-one million, three hundred sixteen thousand, one".