127785601 has 4 divisors (see below), whose sum is σ = 127808212. Its totient is φ = 127762992.

The previous prime is 127785599. The next prime is 127785613. The reversal of 127785601 is 106587721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 48664576 + 79121025 = 6976^2 + 8895^2 .

It is a cyclic number.

It is not a de Polignac number, because 127785601 - 2¹ = 127785599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127785001) 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, 5455 + ... + 16891.

It is an arithmetic number, because the mean of its divisors is an integer number (31952053).

Almost surely, 2^127785601 is an apocalyptic number.

It is an amenable number.

127785601 is a deficient number, since it is larger than the sum of its proper divisors (22611).

127785601 is a wasteful number, since it uses less digits than its factorization.

127785601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22610.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 127785601 is about 11304.2293412687. The cubic root of 127785601 is about 503.6868816525.

The spelling of 127785601 in words is "one hundred twenty-seven million, seven hundred eighty-five thousand, six hundred one".