127775491 has 2 divisors, whose sum is σ = 127775492. Its totient is φ = 127775490.

The previous prime is 127775471. The next prime is 127775509. The reversal of 127775491 is 194577721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127775491 is a prime.

It is a super-2 number, since 2×127775491² = 32653152200582162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127775411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63887745 + 63887746.

It is an arithmetic number, because the mean of its divisors is an integer number (63887746).

Almost surely, 2^127775491 is an apocalyptic number.

127775491 is a deficient number, since it is larger than the sum of its proper divisors (1).

127775491 is an equidigital number, since it uses as much as digits as its factorization.

127775491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 43.

The square root of 127775491 is about 11303.7821546596. The cubic root of 127775491 is about 503.6735979214.

The spelling of 127775491 in words is "one hundred twenty-seven million, seven hundred seventy-five thousand, four hundred ninety-one".