123021569479 has 2 divisors, whose sum is σ = 123021569480. Its totient is φ = 123021569478.

The previous prime is 123021569449. The next prime is 123021569497. The reversal of 123021569479 is 974965120321.

Together with next prime (123021569497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123021569479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123021569449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510784739 + 61510784740.

It is an arithmetic number, because the mean of its divisors is an integer number (61510784740).

Almost surely, 2^123021569479 is an apocalyptic number.

123021569479 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021569479 is an equidigital number, since it uses as much as digits as its factorization.

123021569479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 123021569479 in words is "one hundred twenty-three billion, twenty-one million, five hundred sixty-nine thousand, four hundred seventy-nine".