125128819 has 2 divisors, whose sum is σ = 125128820. Its totient is φ = 125128818.

The previous prime is 125128807. The next prime is 125128831. The reversal of 125128819 is 918821521.

It is a balanced prime because it is at equal distance from previous prime (125128807) and next prime (125128831).

It is a cyclic number.

It is not a de Polignac number, because 125128819 - 2¹⁵ = 125096051 is a prime.

It is a super-2 number, since 2×125128819² = 31314442688669522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125128849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62564409 + 62564410.

It is an arithmetic number, because the mean of its divisors is an integer number (62564410).

Almost surely, 2^125128819 is an apocalyptic number.

125128819 is a deficient number, since it is larger than the sum of its proper divisors (1).

125128819 is an equidigital number, since it uses as much as digits as its factorization.

125128819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 37.

The square root of 125128819 is about 11186.0993648367. The cubic root of 125128819 is about 500.1716996983.

The spelling of 125128819 in words is "one hundred twenty-five million, one hundred twenty-eight thousand, eight hundred nineteen".