613881641 has 2 divisors, whose sum is σ = 613881642. Its totient is φ = 613881640.

The previous prime is 613881629. The next prime is 613881649. The reversal of 613881641 is 146188316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548918041 + 64963600 = 23429^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 613881641 - 2²⁶ = 546772777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 613881595 and 613881604.

It is not a weakly prime, because it can be changed into another prime (613881649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306940820 + 306940821.

It is an arithmetic number, because the mean of its divisors is an integer number (306940821).

Almost surely, 2^613881641 is an apocalyptic number.

It is an amenable number.

613881641 is a deficient number, since it is larger than the sum of its proper divisors (1).

613881641 is an equidigital number, since it uses as much as digits as its factorization.

613881641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 613881641 is about 24776.6349813690. The cubic root of 613881641 is about 849.8877088109.

The spelling of 613881641 in words is "six hundred thirteen million, eight hundred eighty-one thousand, six hundred forty-one".