127165861 has 2 divisors, whose sum is σ = 127165862. Its totient is φ = 127165860.

The previous prime is 127165823. The next prime is 127165889. The reversal of 127165861 is 168561721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116964225 + 10201636 = 10815^2 + 3194^2 .

It is an emirp because it is prime and its reverse (168561721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127165861 - 2⁷ = 127165733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127165861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127165811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63582930 + 63582931.

It is an arithmetic number, because the mean of its divisors is an integer number (63582931).

Almost surely, 2^127165861 is an apocalyptic number.

It is an amenable number.

127165861 is a deficient number, since it is larger than the sum of its proper divisors (1).

127165861 is an equidigital number, since it uses as much as digits as its factorization.

127165861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 127165861 is about 11276.7841603890. The cubic root of 127165861 is about 502.8712944406.

The spelling of 127165861 in words is "one hundred twenty-seven million, one hundred sixty-five thousand, eight hundred sixty-one".