127564813 has 2 divisors, whose sum is σ = 127564814. Its totient is φ = 127564812.

The previous prime is 127564781. The next prime is 127564861. The reversal of 127564813 is 318465721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 19342404 = 10403^2 + 4398^2 .

It is a cyclic number.

It is not a de Polignac number, because 127564813 - 2⁵ = 127564781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127564873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63782406 + 63782407.

It is an arithmetic number, because the mean of its divisors is an integer number (63782407).

Almost surely, 2^127564813 is an apocalyptic number.

It is an amenable number.

127564813 is a deficient number, since it is larger than the sum of its proper divisors (1).

127564813 is an equidigital number, since it uses as much as digits as its factorization.

127564813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 127564813 is about 11294.4593938798. The cubic root of 127564813 is about 503.3966243039.

The spelling of 127564813 in words is "one hundred twenty-seven million, five hundred sixty-four thousand, eight hundred thirteen".