125864309 has 4 divisors (see below), whose sum is σ = 129924480. Its totient is φ = 121804140.

The previous prime is 125864273. The next prime is 125864353. The reversal of 125864309 is 903468521.

It is a happy number.

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: 903468521 = 9719 ⋅92959.

It is a cyclic number.

It is not a de Polignac number, because 125864309 - 2¹⁶ = 125798773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125864369) 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, 2030039 + ... + 2030100.

It is an arithmetic number, because the mean of its divisors is an integer number (32481120).

Almost surely, 2^125864309 is an apocalyptic number.

It is an amenable number.

125864309 is a deficient number, since it is larger than the sum of its proper divisors (4060171).

125864309 is an equidigital number, since it uses as much as digits as its factorization.

125864309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060170.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 125864309 is about 11218.9263746581. The cubic root of 125864309 is about 501.1497660495.

The spelling of 125864309 in words is "one hundred twenty-five million, eight hundred sixty-four thousand, three hundred nine".