125561777 has 8 divisors (see below), whose sum is σ = 137093472. Its totient is φ = 114049600.

The previous prime is 125561767. The next prime is 125561791. The reversal of 125561777 is 777165521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 125561777 - 2⁶ = 125561713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125561767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10778 + ... + 19164.

It is an arithmetic number, because the mean of its divisors is an integer number (17136684).

Almost surely, 2^125561777 is an apocalyptic number.

It is an amenable number.

125561777 is a deficient number, since it is larger than the sum of its proper divisors (11531695).

125561777 is a wasteful number, since it uses less digits than its factorization.

125561777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9759.

The product of its digits is 102900, while the sum is 41.

The square root of 125561777 is about 11205.4351544239. The cubic root of 125561777 is about 500.7479166834.

The spelling of 125561777 in words is "one hundred twenty-five million, five hundred sixty-one thousand, seven hundred seventy-seven".