127891019 has 2 divisors, whose sum is σ = 127891020. Its totient is φ = 127891018.

The previous prime is 127890991. The next prime is 127891037. The reversal of 127891019 is 910198721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127891019 is a prime.

It is a super-2 number, since 2×127891019² = 32712225481716722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127891039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63945509 + 63945510.

It is an arithmetic number, because the mean of its divisors is an integer number (63945510).

Almost surely, 2^127891019 is an apocalyptic number.

127891019 is a deficient number, since it is larger than the sum of its proper divisors (1).

127891019 is an equidigital number, since it uses as much as digits as its factorization.

127891019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 127891019 is about 11308.8911481188. The cubic root of 127891019 is about 503.8253507466.

The spelling of 127891019 in words is "one hundred twenty-seven million, eight hundred ninety-one thousand, nineteen".