127981019 has 2 divisors, whose sum is σ = 127981020. Its totient is φ = 127981018.

The previous prime is 127981013. The next prime is 127981033. The reversal of 127981019 is 910189721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127981019 - 2¹⁶ = 127915483 is a prime.

It is a super-2 number, since 2×127981019² = 32758282448556722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127981013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63990509 + 63990510.

It is an arithmetic number, because the mean of its divisors is an integer number (63990510).

Almost surely, 2^127981019 is an apocalyptic number.

127981019 is a deficient number, since it is larger than the sum of its proper divisors (1).

127981019 is an equidigital number, since it uses as much as digits as its factorization.

127981019 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 127981019 is about 11312.8696182710. The cubic root of 127981019 is about 503.9435077250.

The spelling of 127981019 in words is "one hundred twenty-seven million, nine hundred eighty-one thousand, nineteen".