123280981 has 2 divisors, whose sum is σ = 123280982. Its totient is φ = 123280980.

The previous prime is 123280967. The next prime is 123281027. The reversal of 123280981 is 189082321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 37625956 = 9255^2 + 6134^2 .

It is a cyclic number.

It is not a de Polignac number, because 123280981 - 2¹⁷ = 123149909 is a prime.

It is a super-2 number, since 2×123280981² = 30396400552644722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123280901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61640490 + 61640491.

It is an arithmetic number, because the mean of its divisors is an integer number (61640491).

Almost surely, 2^123280981 is an apocalyptic number.

It is an amenable number.

123280981 is a deficient number, since it is larger than the sum of its proper divisors (1).

123280981 is an equidigital number, since it uses as much as digits as its factorization.

123280981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 123280981 is about 11103.1968819795. The cubic root of 123280981 is about 497.6973868904.

The spelling of 123280981 in words is "one hundred twenty-three million, two hundred eighty thousand, nine hundred eighty-one".