621840097441 has 2 divisors, whose sum is σ = 621840097442. Its totient is φ = 621840097440.

The previous prime is 621840097433. The next prime is 621840097457. The reversal of 621840097441 is 144790048126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586694721600 + 35145375841 = 765960^2 + 187471^2 .

It is a cyclic number.

It is not a de Polignac number, because 621840097441 - 2³ = 621840097433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 621840097391 and 621840097400.

It is not a weakly prime, because it can be changed into another prime (621840092441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310920048720 + 310920048721.

It is an arithmetic number, because the mean of its divisors is an integer number (310920048721).

Almost surely, 2^621840097441 is an apocalyptic number.

It is an amenable number.

621840097441 is a deficient number, since it is larger than the sum of its proper divisors (1).

621840097441 is an equidigital number, since it uses as much as digits as its factorization.

621840097441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 621840097441 in words is "six hundred twenty-one billion, eight hundred forty million, ninety-seven thousand, four hundred forty-one".