619628861 has 2 divisors, whose sum is σ = 619628862. Its totient is φ = 619628860.

The previous prime is 619628843. The next prime is 619628873. The reversal of 619628861 is 168826916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457703236 + 161925625 = 21394^2 + 12725^2 .

It is a cyclic number.

It is not a de Polignac number, because 619628861 - 2²² = 615434557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (619628831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309814430 + 309814431.

It is an arithmetic number, because the mean of its divisors is an integer number (309814431).

Almost surely, 2^619628861 is an apocalyptic number.

It is an amenable number.

619628861 is a deficient number, since it is larger than the sum of its proper divisors (1).

619628861 is an equidigital number, since it uses as much as digits as its factorization.

619628861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 619628861 is about 24892.3454298706. The cubic root of 619628861 is about 852.5317187053.

The spelling of 619628861 in words is "six hundred nineteen million, six hundred twenty-eight thousand, eight hundred sixty-one".