1623643513 has 2 divisors, whose sum is σ = 1623643514. Its totient is φ = 1623643512.

The previous prime is 1623643481. The next prime is 1623643519. The reversal of 1623643513 is 3153463261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1468192489 + 155451024 = 38317^2 + 12468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623643513 - 2⁵ = 1623643481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623643519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811821756 + 811821757.

It is an arithmetic number, because the mean of its divisors is an integer number (811821757).

Almost surely, 2^1623643513 is an apocalyptic number.

It is an amenable number.

1623643513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623643513 is an equidigital number, since it uses as much as digits as its factorization.

1623643513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 34.

The square root of 1623643513 is about 40294.4600782788. The cubic root of 1623643513 is about 1175.3401189523.

The spelling of 1623643513 in words is "one billion, six hundred twenty-three million, six hundred forty-three thousand, five hundred thirteen".