123870854581 has 2 divisors, whose sum is σ = 123870854582. Its totient is φ = 123870854580.

The previous prime is 123870854573. The next prime is 123870854593. The reversal of 123870854581 is 185458078321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107725086225 + 16145768356 = 328215^2 + 127066^2 .

It is a cyclic number.

It is not a de Polignac number, because 123870854581 - 2³ = 123870854573 is a prime.

It is a super-2 number, since 2×123870854581² (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 (123870354581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61935427290 + 61935427291.

It is an arithmetic number, because the mean of its divisors is an integer number (61935427291).

Almost surely, 2^123870854581 is an apocalyptic number.

It is an amenable number.

123870854581 is a deficient number, since it is larger than the sum of its proper divisors (1).

123870854581 is an equidigital number, since it uses as much as digits as its factorization.

123870854581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 123870854581 in words is "one hundred twenty-three billion, eight hundred seventy million, eight hundred fifty-four thousand, five hundred eighty-one".