126911981 has 8 divisors (see below), whose sum is σ = 145200000. Its totient is φ = 108663408.

The previous prime is 126911971. The next prime is 126912011. The reversal of 126911981 is 189119621.

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

It is not a de Polignac number, because 126911981 - 2¹⁴ = 126895597 is a prime.

It is a super-2 number, since 2×126911981² = 32213301842688722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126911971) 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, 2606 + ... + 16143.

It is an arithmetic number, because the mean of its divisors is an integer number (18150000).

Almost surely, 2^126911981 is an apocalyptic number.

It is an amenable number.

126911981 is a deficient number, since it is larger than the sum of its proper divisors (18288019).

126911981 is an equidigital number, since it uses as much as digits as its factorization.

126911981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19723.

The product of its digits is 7776, while the sum is 38.

The square root of 126911981 is about 11265.5217810805. The cubic root of 126911981 is about 502.5364193961.

The spelling of 126911981 in words is "one hundred twenty-six million, nine hundred eleven thousand, nine hundred eighty-one".