125645777 has 4 divisors (see below), whose sum is σ = 129978420. Its totient is φ = 121313136.

The previous prime is 125645743. The next prime is 125645783. The reversal of 125645777 is 777546521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66601921 + 59043856 = 8161^2 + 7684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125645777 is a prime.

It is a super-2 number, since 2×125645777² = 31573722555867458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125645677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166278 + ... + 2166335.

It is an arithmetic number, because the mean of its divisors is an integer number (32494605).

Almost surely, 2^125645777 is an apocalyptic number.

It is an amenable number.

125645777 is a deficient number, since it is larger than the sum of its proper divisors (4332643).

125645777 is an equidigital number, since it uses as much as digits as its factorization.

125645777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332642.

The product of its digits is 411600, while the sum is 44.

The square root of 125645777 is about 11209.1827088330. The cubic root of 125645777 is about 500.8595574751.

The spelling of 125645777 in words is "one hundred twenty-five million, six hundred forty-five thousand, seven hundred seventy-seven".