127481991 has 32 divisors (see below), whose sum is σ = 212179968. Its totient is φ = 66286080.

The previous prime is 127481969. The next prime is 127481993. The reversal of 127481991 is 199184721.

It is not a de Polignac number, because 127481991 - 2¹⁴ = 127465607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127481993) 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, 16095 + ... + 22671.

It is an arithmetic number, because the mean of its divisors is an integer number (6630624).

Almost surely, 2^127481991 is an apocalyptic number.

127481991 is a deficient number, since it is larger than the sum of its proper divisors (84697977).

127481991 is a wasteful number, since it uses less digits than its factorization.

127481991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671.

The product of its digits is 36288, while the sum is 42.

The square root of 127481991 is about 11290.7923105511. The cubic root of 127481991 is about 503.2876565814.

The spelling of 127481991 in words is "one hundred twenty-seven million, four hundred eighty-one thousand, nine hundred ninety-one".