623267861 has 2 divisors, whose sum is σ = 623267862. Its totient is φ = 623267860.

The previous prime is 623267839. The next prime is 623267903. The reversal of 623267861 is 168762326.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595652836 + 27615025 = 24406^2 + 5255^2 .

It is a cyclic number.

It is not a de Polignac number, because 623267861 - 2²² = 619073557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623267761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311633930 + 311633931.

It is an arithmetic number, because the mean of its divisors is an integer number (311633931).

Almost surely, 2^623267861 is an apocalyptic number.

It is an amenable number.

623267861 is a deficient number, since it is larger than the sum of its proper divisors (1).

623267861 is an equidigital number, since it uses as much as digits as its factorization.

623267861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 623267861 is about 24965.3331842377. Note that the first 3 decimals coincide. The cubic root of 623267861 is about 854.1973982751.

The spelling of 623267861 in words is "six hundred twenty-three million, two hundred sixty-seven thousand, eight hundred sixty-one".