623087021 has 2 divisors, whose sum is σ = 623087022. Its totient is φ = 623087020.

The previous prime is 623086973. The next prime is 623087057. The reversal of 623087021 is 120780326.

It is a happy number.

623087021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383611396 + 239475625 = 19586^2 + 15475^2 .

It is a cyclic number.

It is not a de Polignac number, because 623087021 - 2¹⁸ = 622824877 is a prime.

It is a super-3 number, since 3×623087021³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643087021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311543510 + 311543511.

It is an arithmetic number, because the mean of its divisors is an integer number (311543511).

Almost surely, 2^623087021 is an apocalyptic number.

It is an amenable number.

623087021 is a deficient number, since it is larger than the sum of its proper divisors (1).

623087021 is an equidigital number, since it uses as much as digits as its factorization.

623087021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 623087021 is about 24961.7110992015. The cubic root of 623087021 is about 854.1147756931.

The spelling of 623087021 in words is "six hundred twenty-three million, eighty-seven thousand, twenty-one".