125491019 has 2 divisors, whose sum is σ = 125491020. Its totient is φ = 125491018.

The previous prime is 125490997. The next prime is 125491031. The reversal of 125491019 is 910194521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125491019 is a prime.

It is a super-2 number, since 2×125491019² = 31495991699316722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125491039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62745509 + 62745510.

It is an arithmetic number, because the mean of its divisors is an integer number (62745510).

Almost surely, 2^125491019 is an apocalyptic number.

125491019 is a deficient number, since it is larger than the sum of its proper divisors (1).

125491019 is an equidigital number, since it uses as much as digits as its factorization.

125491019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 125491019 is about 11202.2774023856. The cubic root of 125491019 is about 500.6538366227.

The spelling of 125491019 in words is "one hundred twenty-five million, four hundred ninety-one thousand, nineteen".