621120001 has 4 divisors (see below), whose sum is σ = 621702100. Its totient is φ = 620537904.

The previous prime is 621119987. The next prime is 621120047. The reversal of 621120001 is 100021126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 377291776 + 243828225 = 19424^2 + 15615^2 .

It is a cyclic number.

It is not a de Polignac number, because 621120001 - 2⁹ = 621119489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621120601) 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, 289446 + ... + 291583.

It is an arithmetic number, because the mean of its divisors is an integer number (155425525).

Almost surely, 2^621120001 is an apocalyptic number.

It is an amenable number.

621120001 is a deficient number, since it is larger than the sum of its proper divisors (582099).

621120001 is a wasteful number, since it uses less digits than its factorization.

621120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582098.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 621120001 is about 24922.2792095747. The cubic root of 621120001 is about 853.2150448253.

Adding to 621120001 its reverse (100021126), we get a palindrome (721141127).

The spelling of 621120001 in words is "six hundred twenty-one million, one hundred twenty thousand, one".