621382252791 has 32 divisors (see below), whose sum is σ = 878514190848. Its totient is φ = 389323550720.

The previous prime is 621382252789. The next prime is 621382252793. The reversal of 621382252791 is 197252283126.

621382252791 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (621382252789) and next prime (621382252793).

It is a cyclic number.

It is not a de Polignac number, because 621382252791 - 2¹ = 621382252789 is a prime.

It is a super-2 number, since 2×621382252791² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621382252791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621382252793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145078936 + ... + 145083218.

It is an arithmetic number, because the mean of its divisors is an integer number (27453568464).

Almost surely, 2^621382252791 is an apocalyptic number.

621382252791 is a deficient number, since it is larger than the sum of its proper divisors (257131938057).

621382252791 is a wasteful number, since it uses less digits than its factorization.

621382252791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7751.

The product of its digits is 725760, while the sum is 48.

The spelling of 621382252791 in words is "six hundred twenty-one billion, three hundred eighty-two million, two hundred fifty-two thousand, seven hundred ninety-one".