123876981 has 6 divisors (see below), whose sum is σ = 178933430. Its totient is φ = 82584648.

The previous prime is 123876971. The next prime is 123876989. The reversal of 123876981 is 189678321.

It can be written as a sum of positive squares in only one way, i.e., 123876900 + 81 = 11130^2 + 9^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123876981 is a prime.

It is a super-2 number, since 2×123876981² = 30691012843348722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123876989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6882046 + ... + 6882063.

Almost surely, 2^123876981 is an apocalyptic number.

It is an amenable number.

123876981 is a deficient number, since it is larger than the sum of its proper divisors (55056449).

123876981 is a wasteful number, since it uses less digits than its factorization.

123876981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13764115 (or 13764112 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 123876981 is about 11130.0036388134. The cubic root of 123876981 is about 498.4981346511.

It can be divided in two parts, 1238769 and 81, that multiplied together give a square (100340289 = 10017²).

The spelling of 123876981 in words is "one hundred twenty-three million, eight hundred seventy-six thousand, nine hundred eighty-one".