127611981 has 24 divisors (see below), whose sum is σ = 219822720. Its totient is φ = 69749856.

The previous prime is 127611941. The next prime is 127611983. The reversal of 127611981 is 189116721.

It is not a de Polignac number, because 127611981 - 2¹⁰ = 127610957 is a prime.

It is a super-2 number, since 2×127611981² = 32569635389488722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127611983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42586 + ... + 45483.

It is an arithmetic number, because the mean of its divisors is an integer number (9159280).

Almost surely, 2^127611981 is an apocalyptic number.

It is an amenable number.

127611981 is a deficient number, since it is larger than the sum of its proper divisors (92210739).

127611981 is a wasteful number, since it uses less digits than its factorization.

127611981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88105 (or 88102 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 127611981 is about 11296.5473043758. The cubic root of 127611981 is about 503.4586614898.

The spelling of 127611981 in words is "one hundred twenty-seven million, six hundred eleven thousand, nine hundred eighty-one".