621541841 has 2 divisors, whose sum is σ = 621541842. Its totient is φ = 621541840.

The previous prime is 621541829. The next prime is 621541859. The reversal of 621541841 is 148145126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445210000 + 176331841 = 21100^2 + 13279^2 .

It is a cyclic number.

It is not a de Polignac number, because 621541841 - 2¹⁰ = 621540817 is a prime.

It is a super-2 number, since 2×621541841² = 772628520227338562, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 621541798 and 621541807.

It is not a weakly prime, because it can be changed into another prime (621541801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310770920 + 310770921.

It is an arithmetic number, because the mean of its divisors is an integer number (310770921).

Almost surely, 2^621541841 is an apocalyptic number.

It is an amenable number.

621541841 is a deficient number, since it is larger than the sum of its proper divisors (1).

621541841 is an equidigital number, since it uses as much as digits as its factorization.

621541841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 621541841 is about 24930.7408834956. The cubic root of 621541841 is about 853.4081576878.

Adding to 621541841 its reverse (148145126), we get a palindrome (769686967).

The spelling of 621541841 in words is "six hundred twenty-one million, five hundred forty-one thousand, eight hundred forty-one".