127785501 has 6 divisors (see below), whose sum is σ = 184579070. Its totient is φ = 85190328.

The previous prime is 127785487. The next prime is 127785509. The reversal of 127785501 is 105587721.

127785501 is a `hidden beast` number, since 1 + 2 + 77 + 85 + 501 = 666.

It can be written as a sum of positive squares in only one way, i.e., 127712601 + 72900 = 11301^2 + 270^2 .

It is not a de Polignac number, because 127785501 - 2⁹ = 127784989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127785509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7099186 + ... + 7099203.

Almost surely, 2^127785501 is an apocalyptic number.

It is an amenable number.

127785501 is a deficient number, since it is larger than the sum of its proper divisors (56793569).

127785501 is a wasteful number, since it uses less digits than its factorization.

127785501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14198395 (or 14198392 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 127785501 is about 11304.2249181445. The cubic root of 127785501 is about 503.6867502639.

The spelling of 127785501 in words is "one hundred twenty-seven million, seven hundred eighty-five thousand, five hundred one".