125121777 has 8 divisors (see below), whose sum is σ = 181995360. Its totient is φ = 75831360.

The previous prime is 125121767. The next prime is 125121779. The reversal of 125121777 is 777121521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125121777 - 2⁴ = 125121761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 3791569 = 125121777 / (1 + 2 + 5 + 1 + 2 + 1 + 7 + 7 + 7).

It is not an unprimeable number, because it can be changed into a prime (125121779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1895752 + ... + 1895817.

It is an arithmetic number, because the mean of its divisors is an integer number (22749420).

Almost surely, 2^125121777 is an apocalyptic number.

It is an amenable number.

125121777 is a deficient number, since it is larger than the sum of its proper divisors (56873583).

125121777 is a wasteful number, since it uses less digits than its factorization.

125121777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791583.

The product of its digits is 6860, while the sum is 33.

The square root of 125121777 is about 11185.7845947435. The cubic root of 125121777 is about 500.1623166343.

The spelling of 125121777 in words is "one hundred twenty-five million, one hundred twenty-one thousand, seven hundred seventy-seven".