125817557 has 4 divisors (see below), whose sum is σ = 125841120. Its totient is φ = 125793996.

The previous prime is 125817553. The next prime is 125817569. The reversal of 125817557 is 755718521.

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.

It is a cyclic number.

It is not a de Polignac number, because 125817557 - 2² = 125817553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125817553) 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 3 ways as a sum of consecutive naturals, for example, 488 + ... + 15870.

It is an arithmetic number, because the mean of its divisors is an integer number (31460280).

Almost surely, 2^125817557 is an apocalyptic number.

It is an amenable number.

125817557 is a deficient number, since it is larger than the sum of its proper divisors (23563).

125817557 is an equidigital number, since it uses as much as digits as its factorization.

125817557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23562.

The product of its digits is 98000, while the sum is 41.

The square root of 125817557 is about 11216.8425592945. The cubic root of 125817557 is about 501.0877080665.

The spelling of 125817557 in words is "one hundred twenty-five million, eight hundred seventeen thousand, five hundred fifty-seven".