125798657 has 8 divisors (see below), whose sum is σ = 133698600. Its totient is φ = 117954304.

The previous prime is 125798641. The next prime is 125798669. The reversal of 125798657 is 756897521.

It is a Cunningham number, because it is equal to 11216²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 125798656 = 1^2 + 11216^2 .

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 125798657 - 2⁴ = 125798641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125798357) 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, 9182 + ... + 18327.

It is an arithmetic number, because the mean of its divisors is an integer number (16712325).

Almost surely, 2^125798657 is an apocalyptic number.

125798657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

125798657 is a deficient number, since it is larger than the sum of its proper divisors (7899943).

125798657 is a wasteful number, since it uses less digits than its factorization.

125798657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27795.

The product of its digits is 1058400, while the sum is 50.

The square root of 125798657 is about 11216.0000445792. Note that the first 4 decimals coincide. The cubic root of 125798657 is about 501.0626160943.

The spelling of 125798657 in words is "one hundred twenty-five million, seven hundred ninety-eight thousand, six hundred fifty-seven".