125720019 has 20 divisors (see below), whose sum is σ = 188186944. Its totient is φ = 83642544.

The previous prime is 125720011. The next prime is 125720027. The reversal of 125720019 is 910027521.

It is an interprime number because it is at equal distance from previous prime (125720011) and next prime (125720027).

It is not a de Polignac number, because 125720019 - 2³ = 125720011 is a prime.

It is a super-2 number, since 2×125720019² = 31611046354720722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125719974 and 125720001.

It is not an unprimeable number, because it can be changed into a prime (125720011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 47889 + ... + 50445.

Almost surely, 2^125720019 is an apocalyptic number.

125720019 is a deficient number, since it is larger than the sum of its proper divisors (62466925).

125720019 is an equidigital number, since it uses as much as digits as its factorization.

125720019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 3167 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 125720019 is about 11212.4938795970. The cubic root of 125720019 is about 500.9581879122.

The spelling of 125720019 in words is "one hundred twenty-five million, seven hundred twenty thousand, nineteen".