123932841581 has 2 divisors, whose sum is σ = 123932841582. Its totient is φ = 123932841580.

The previous prime is 123932841551. The next prime is 123932841691. The reversal of 123932841581 is 185148239321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82331120356 + 41601721225 = 286934^2 + 203965^2 .

It is a cyclic number.

It is not a de Polignac number, because 123932841581 - 2⁶ = 123932841517 is a prime.

It is a super-2 number, since 2×123932841581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123932841541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61966420790 + 61966420791.

It is an arithmetic number, because the mean of its divisors is an integer number (61966420791).

Almost surely, 2^123932841581 is an apocalyptic number.

It is an amenable number.

123932841581 is a deficient number, since it is larger than the sum of its proper divisors (1).

123932841581 is an equidigital number, since it uses as much as digits as its factorization.

123932841581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The spelling of 123932841581 in words is "one hundred twenty-three billion, nine hundred thirty-two million, eight hundred forty-one thousand, five hundred eighty-one".