125000019 has 12 divisors (see below), whose sum is σ = 180766456. Its totient is φ = 83236032.

The previous prime is 125000003. The next prime is 125000077. The reversal of 125000019 is 910000521.

It is not a de Polignac number, because 125000019 - 2⁴ = 125000003 is a prime.

It is a super-2 number, since 2×125000019² = 31250009500000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 124999965 and 125000010.

It is not an unprimeable number, because it can be changed into a prime (125000089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507 + ... + 15819.

Almost surely, 2^125000019 is an apocalyptic number.

125000019 is a deficient number, since it is larger than the sum of its proper divisors (55766437).

125000019 is a wasteful number, since it uses less digits than its factorization.

125000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16226 (or 16223 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 125000019 is about 11180.3407372047. The cubic root of 125000019 is about 500.0000253333. Note that the first 4 decimals are identical.

The spelling of 125000019 in words is "one hundred twenty-five million, nineteen", and thus it is an aban number.