123215212489 has 2 divisors, whose sum is σ = 123215212490. Its totient is φ = 123215212488.

The previous prime is 123215212409. The next prime is 123215212493. The reversal of 123215212489 is 984212512321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68888926089 + 54326286400 = 262467^2 + 233080^2 .

It is an emirp because it is prime and its reverse (984212512321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123215212489 - 2¹¹ = 123215210441 is a prime.

It is not a weakly prime, because it can be changed into another prime (123215212409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61607606244 + 61607606245.

It is an arithmetic number, because the mean of its divisors is an integer number (61607606245).

Almost surely, 2^123215212489 is an apocalyptic number.

It is an amenable number.

123215212489 is a deficient number, since it is larger than the sum of its proper divisors (1).

123215212489 is an equidigital number, since it uses as much as digits as its factorization.

123215212489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The spelling of 123215212489 in words is "one hundred twenty-three billion, two hundred fifteen million, two hundred twelve thousand, four hundred eighty-nine".