127686981 has 4 divisors (see below), whose sum is σ = 170249312. Its totient is φ = 85124652.

The previous prime is 127686953. The next prime is 127687003. The reversal of 127686981 is 189686721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 127686981 - 2⁶ = 127686917 is a prime.

It is a super-2 number, since 2×127686981² = 32607930233788722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127686981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127686281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21281161 + ... + 21281166.

It is an arithmetic number, because the mean of its divisors is an integer number (42562328).

Almost surely, 2^127686981 is an apocalyptic number.

It is an amenable number.

127686981 is a deficient number, since it is larger than the sum of its proper divisors (42562331).

127686981 is an equidigital number, since it uses as much as digits as its factorization.

127686981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42562330.

The product of its digits is 290304, while the sum is 48.

The square root of 127686981 is about 11299.8664151396. The cubic root of 127686981 is about 503.5572729327.

The spelling of 127686981 in words is "one hundred twenty-seven million, six hundred eighty-six thousand, nine hundred eighty-one".