621818941 has 2 divisors, whose sum is σ = 621818942. Its totient is φ = 621818940.

The previous prime is 621818903. The next prime is 621818959. The reversal of 621818941 is 149818126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583947225 + 37871716 = 24165^2 + 6154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621818941 is a prime.

It is a super-2 number, since 2×621818941² = 773317590772722962, 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 = 621818894 and 621818903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621810941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310909470 + 310909471.

It is an arithmetic number, because the mean of its divisors is an integer number (310909471).

Almost surely, 2^621818941 is an apocalyptic number.

It is an amenable number.

621818941 is a deficient number, since it is larger than the sum of its proper divisors (1).

621818941 is an equidigital number, since it uses as much as digits as its factorization.

621818941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 40.

The square root of 621818941 is about 24936.2976602382. The cubic root of 621818941 is about 853.5349629167.

The spelling of 621818941 in words is "six hundred twenty-one million, eight hundred eighteen thousand, nine hundred forty-one".