125840569 has 4 divisors (see below), whose sum is σ = 127973520. Its totient is φ = 123707620.

The previous prime is 125840557. The next prime is 125840581. The reversal of 125840569 is 965048521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 965048521 = 7681 ⋅125641.

It is an interprime number because it is at equal distance from previous prime (125840557) and next prime (125840581).

It is a cyclic number.

It is not a de Polignac number, because 125840569 - 2⁵ = 125840537 is a prime.

It is a super-2 number, since 2×125840569² = 31671697612487522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125840509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066387 + ... + 1066504.

It is an arithmetic number, because the mean of its divisors is an integer number (31993380).

Almost surely, 2^125840569 is an apocalyptic number.

It is an amenable number.

125840569 is a deficient number, since it is larger than the sum of its proper divisors (2132951).

125840569 is an equidigital number, since it uses as much as digits as its factorization.

125840569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132950.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 125840569 is about 11217.8682912575. The cubic root of 125840569 is about 501.1182558101.

The spelling of 125840569 in words is "one hundred twenty-five million, eight hundred forty thousand, five hundred sixty-nine".