621056242 has 8 divisors (see below), whose sum is σ = 931946076. Its totient is φ = 310407552.

The previous prime is 621056239. The next prime is 621056251. The reversal of 621056242 is 242650126.

It is a Cunningham number, because it is equal to 24921²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 621056241 + 1 = 24921^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 621056242.

It is an unprimeable number.

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, 53703 + ... + 64234.

Almost surely, 2^621056242 is an apocalyptic number.

621056242 is a deficient number, since it is larger than the sum of its proper divisors (310889834).

621056242 is a wasteful number, since it uses less digits than its factorization.

621056242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120572.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 621056242 is about 24921.0000200634. Note that the first 4 decimals coincide. The cubic root of 621056242 is about 853.1858491790.

The spelling of 621056242 in words is "six hundred twenty-one million, fifty-six thousand, two hundred forty-two".