126881981 has 8 divisors (see below), whose sum is σ = 133721280. Its totient is φ = 120058848.

The previous prime is 126881969. The next prime is 126882023. The reversal of 126881981 is 189188621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126881981 - 2¹⁴ = 126865597 is a prime.

It is a super-2 number, since 2×126881981² = 32198074204968722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126881581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14240 + ... + 21366.

It is an arithmetic number, because the mean of its divisors is an integer number (16715160).

Almost surely, 2^126881981 is an apocalyptic number.

It is an amenable number.

126881981 is a deficient number, since it is larger than the sum of its proper divisors (6839299).

126881981 is an equidigital number, since it uses as much as digits as its factorization.

126881981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083.

The product of its digits is 55296, while the sum is 44.

The square root of 126881981 is about 11264.1902061355. The cubic root of 126881981 is about 502.4968190355.

The spelling of 126881981 in words is "one hundred twenty-six million, eight hundred eighty-one thousand, nine hundred eighty-one".