123261045041989 has 2 divisors, whose sum is σ = 123261045041990. Its totient is φ = 123261045041988.

The previous prime is 123261045041983. The next prime is 123261045042043. The reversal of 123261045041989 is 989140540162321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104690590712964 + 18570454329025 = 10231842^2 + 4309345^2 .

It is a cyclic number.

It is not a de Polignac number, because 123261045041989 - 2⁵ = 123261045041957 is a prime.

It is a super-2 number, since 2×123261045041989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123261045041983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61630522520994 + 61630522520995.

It is an arithmetic number, because the mean of its divisors is an integer number (61630522520995).

Almost surely, 2^{123261045041989} is an apocalyptic number.

It is an amenable number.

123261045041989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123261045041989 is an equidigital number, since it uses as much as digits as its factorization.

123261045041989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 123261045041989 in words is "one hundred twenty-three trillion, two hundred sixty-one billion, forty-five million, forty-one thousand, nine hundred eighty-nine".