621621002 has 4 divisors (see below), whose sum is σ = 932431506. Its totient is φ = 310810500.

The previous prime is 621620999. The next prime is 621621037. The reversal of 621621002 is 200126126.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 374848321 + 246772681 = 19361^2 + 15709^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155405249 + ... + 155405252.

Almost surely, 2^621621002 is an apocalyptic number.

621621002 is a deficient number, since it is larger than the sum of its proper divisors (310810504).

621621002 is a wasteful number, since it uses less digits than its factorization.

621621002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310810503.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 621621002 is about 24932.3284512297. The cubic root of 621621002 is about 853.4443868258. Note that the first 3 decimals are identical.

Adding to 621621002 its reverse (200126126), we get a palindrome (821747128).

The spelling of 621621002 in words is "six hundred twenty-one million, six hundred twenty-one thousand, two".