127987961 has 4 divisors (see below), whose sum is σ = 128301300. Its totient is φ = 127674624.

The previous prime is 127987949. The next prime is 127987969. The reversal of 127987961 is 169789721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169789721 = 421 ⋅403301.

It can be written as a sum of positive squares in 2 ways, for example, as 63282025 + 64705936 = 7955^2 + 8044^2 .

It is a cyclic number.

It is not a de Polignac number, because 127987961 - 2⁶ = 127987897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127987969) 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, 156056 + ... + 156873.

It is an arithmetic number, because the mean of its divisors is an integer number (32075325).

Almost surely, 2^127987961 is an apocalyptic number.

It is an amenable number.

127987961 is a deficient number, since it is larger than the sum of its proper divisors (313339).

127987961 is an equidigital number, since it uses as much as digits as its factorization.

127987961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313338.

The product of its digits is 381024, while the sum is 50.

The square root of 127987961 is about 11313.1764328150. The cubic root of 127987961 is about 503.9526192651.

The spelling of 127987961 in words is "one hundred twenty-seven million, nine hundred eighty-seven thousand, nine hundred sixty-one".