127801997 has 2 divisors, whose sum is σ = 127801998. Its totient is φ = 127801996.

The previous prime is 127801991. The next prime is 127802023. The reversal of 127801997 is 799108721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117375556 + 10426441 = 10834^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 127801997 - 2⁴ = 127801981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127801991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63900998 + 63900999.

It is an arithmetic number, because the mean of its divisors is an integer number (63900999).

Almost surely, 2^127801997 is an apocalyptic number.

It is an amenable number.

127801997 is a deficient number, since it is larger than the sum of its proper divisors (1).

127801997 is an equidigital number, since it uses as much as digits as its factorization.

127801997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 127801997 is about 11304.9545333009. The cubic root of 127801997 is about 503.7084231952.

The spelling of 127801997 in words is "one hundred twenty-seven million, eight hundred one thousand, nine hundred ninety-seven".