125121617 has 4 divisors (see below), whose sum is σ = 125776896. Its totient is φ = 124466340.

The previous prime is 125121599. The next prime is 125121643. The reversal of 125121617 is 716121521.

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: 716121521 = 12491 ⋅57331.

It is a cyclic number.

It is not a de Polignac number, because 125121617 - 2²⁰ = 124073041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125121317) 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, 327353 + ... + 327734.

It is an arithmetic number, because the mean of its divisors is an integer number (31444224).

Almost surely, 2^125121617 is an apocalyptic number.

It is an amenable number.

125121617 is a deficient number, since it is larger than the sum of its proper divisors (655279).

125121617 is an equidigital number, since it uses as much as digits as its factorization.

125121617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655278.

The product of its digits is 840, while the sum is 26.

The square root of 125121617 is about 11185.7774428066. Note that the first 3 decimals coincide. The cubic root of 125121617 is about 500.1621034393.

The spelling of 125121617 in words is "one hundred twenty-five million, one hundred twenty-one thousand, six hundred seventeen".