921443623 has 2 divisors, whose sum is σ = 921443624. Its totient is φ = 921443622.

The previous prime is 921443591. The next prime is 921443657. The reversal of 921443623 is 326344129.

It is a happy number.

It is an a-pointer prime, because the next prime (921443657) can be obtained adding 921443623 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921443623 - 2⁵ = 921443591 is a prime.

It is a super-2 number, since 2×921443623² = 1698116700734732258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921443683) 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, 460721811 + 460721812.

It is an arithmetic number, because the mean of its divisors is an integer number (460721812).

Almost surely, 2^921443623 is an apocalyptic number.

921443623 is a deficient number, since it is larger than the sum of its proper divisors (1).

921443623 is an equidigital number, since it uses as much as digits as its factorization.

921443623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 921443623 is about 30355.2898684891. The cubic root of 921443623 is about 973.0972747141.

The spelling of 921443623 in words is "nine hundred twenty-one million, four hundred forty-three thousand, six hundred twenty-three".