127752661 has 2 divisors, whose sum is σ = 127752662. Its totient is φ = 127752660.

The previous prime is 127752659. The next prime is 127752689. The reversal of 127752661 is 166257721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 36072036 = 9575^2 + 6006^2 .

It is a cyclic number.

It is not a de Polignac number, because 127752661 - 2¹ = 127752659 is a prime.

Together with 127752659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 127752661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127752461) 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 as a sum of consecutive naturals, namely, 63876330 + 63876331.

It is an arithmetic number, because the mean of its divisors is an integer number (63876331).

Almost surely, 2^127752661 is an apocalyptic number.

It is an amenable number.

127752661 is a deficient number, since it is larger than the sum of its proper divisors (1).

127752661 is an equidigital number, since it uses as much as digits as its factorization.

127752661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 127752661 is about 11302.7722705538. The cubic root of 127752661 is about 503.6435985502.

The spelling of 127752661 in words is "one hundred twenty-seven million, seven hundred fifty-two thousand, six hundred sixty-one".