619668631 has 2 divisors, whose sum is σ = 619668632. Its totient is φ = 619668630.

The previous prime is 619668611. The next prime is 619668677. The reversal of 619668631 is 136866916.

It is an a-pointer prime, because the next prime (619668677) can be obtained adding 619668631 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-619668631 is a prime.

It is a super-2 number, since 2×619668631² = 767978424490828322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (619668611) 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, 309834315 + 309834316.

It is an arithmetic number, because the mean of its divisors is an integer number (309834316).

Almost surely, 2^619668631 is an apocalyptic number.

619668631 is a deficient number, since it is larger than the sum of its proper divisors (1).

619668631 is an equidigital number, since it uses as much as digits as its factorization.

619668631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 46.

The square root of 619668631 is about 24893.1442570038. The cubic root of 619668631 is about 852.5499578283.

The spelling of 619668631 in words is "six hundred nineteen million, six hundred sixty-eight thousand, six hundred thirty-one".