5621261623 has 2 divisors, whose sum is σ = 5621261624. Its totient is φ = 5621261622.

The previous prime is 5621261579. The next prime is 5621261671. The reversal of 5621261623 is 3261621265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5621261623 - 2²⁹ = 5084390711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5621261323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810630811 + 2810630812.

It is an arithmetic number, because the mean of its divisors is an integer number (2810630812).

Almost surely, 2^5621261623 is an apocalyptic number.

5621261623 is a deficient number, since it is larger than the sum of its proper divisors (1).

5621261623 is an equidigital number, since it uses as much as digits as its factorization.

5621261623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 5621261623 is about 74975.0733444123. The cubic root of 5621261623 is about 1778.0525795060.

Adding to 5621261623 its reverse (3261621265), we get a palindrome (8882882888).

The spelling of 5621261623 in words is "five billion, six hundred twenty-one million, two hundred sixty-one thousand, six hundred twenty-three".