394610521619 has 2 divisors, whose sum is σ = 394610521620. Its totient is φ = 394610521618.

The previous prime is 394610521609. The next prime is 394610521649. The reversal of 394610521619 is 916125016493.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394610521619 - 2⁴ = 394610521603 is a prime.

It is a super-2 number, since 2×394610521619² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (394610521609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197305260809 + 197305260810.

It is an arithmetic number, because the mean of its divisors is an integer number (197305260810).

Almost surely, 2^394610521619 is an apocalyptic number.

394610521619 is a deficient number, since it is larger than the sum of its proper divisors (1).

394610521619 is an equidigital number, since it uses as much as digits as its factorization.

394610521619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 394610521619 in words is "three hundred ninety-four billion, six hundred ten million, five hundred twenty-one thousand, six hundred nineteen".