127949043981 has 32 divisors (see below), whose sum is σ = 188781014016. Its totient is φ = 76431600000.

The previous prime is 127949043869. The next prime is 127949043983. The reversal of 127949043981 is 189340949721.

It is not a de Polignac number, because 127949043981 - 2⁷ = 127949043853 is a prime.

It is a super-4 number, since 4×127949043981⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127949043983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14210481 + ... + 14219481.

It is an arithmetic number, because the mean of its divisors is an integer number (5899406688).

Almost surely, 2^127949043981 is an apocalyptic number.

127949043981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127949043981 is a deficient number, since it is larger than the sum of its proper divisors (60831970035).

127949043981 is a wasteful number, since it uses less digits than its factorization.

127949043981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15153.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 127949043981 in words is "one hundred twenty-seven billion, nine hundred forty-nine million, forty-three thousand, nine hundred eighty-one".