124991238681 has 27 divisors (see below), whose sum is σ = 181787730943. Its totient is φ = 82756877280.

The previous prime is 124991238667. The next prime is 124991238763. The reversal of 124991238681 is 186832199421.

It is a happy number.

The square root of 124991238681 is 353541.

It is a perfect power (a square), and thus also a powerful number.

124991238681 is a `hidden beast` number, since 1 + 249 + 9 + 12 + 386 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3619827225 + 121371411456 = 60165^2 + 348384^2 .

It is not a de Polignac number, because 124991238681 - 2⁷ = 124991238553 is a prime.

It is a super-2 number, since 2×124991238681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124991238661) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 202578685 + ... + 202579301.

Almost surely, 2^124991238681 is an apocalyptic number.

124991238681 is the 353541-st square number.

124991238681 is the 176771-st centered octagonal number.

It is an amenable number.

124991238681 is a deficient number, since it is larger than the sum of its proper divisors (56796492262).

124991238681 is an frugal number, since it uses more digits than its factorization.

124991238681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622 (or 811 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 124991238681 in words is "one hundred twenty-four billion, nine hundred ninety-one million, two hundred thirty-eight thousand, six hundred eighty-one".