127987501 has 2 divisors, whose sum is σ = 127987502. Its totient is φ = 127987500.

The previous prime is 127987481. The next prime is 127987507. The reversal of 127987501 is 105789721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110565225 + 17422276 = 10515^2 + 4174^2 .

It is an emirp because it is prime and its reverse (105789721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127987501 - 2²⁵ = 94433069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127987507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63993750 + 63993751.

It is an arithmetic number, because the mean of its divisors is an integer number (63993751).

Almost surely, 2^127987501 is an apocalyptic number.

It is an amenable number.

127987501 is a deficient number, since it is larger than the sum of its proper divisors (1).

127987501 is an equidigital number, since it uses as much as digits as its factorization.

127987501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 127987501 is about 11313.1561025206. The cubic root of 127987501 is about 503.9520155144.

The spelling of 127987501 in words is "one hundred twenty-seven million, nine hundred eighty-seven thousand, five hundred one".