125520551 has 8 divisors (see below), whose sum is σ = 135320640. Its totient is φ = 115741152.

The previous prime is 125520541. The next prime is 125520601. The reversal of 125520551 is 155025521.

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 125520551 - 2⁶ = 125520487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125520551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125520541) 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 7 ways as a sum of consecutive naturals, for example, 8861 + ... + 18153.

It is an arithmetic number, because the mean of its divisors is an integer number (16915080).

Almost surely, 2^125520551 is an apocalyptic number.

125520551 is a deficient number, since it is larger than the sum of its proper divisors (9800089).

125520551 is a wasteful number, since it uses less digits than its factorization.

125520551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10345.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 125520551 is about 11203.5954496760. The cubic root of 125520551 is about 500.6931067621.

The spelling of 125520551 in words is "one hundred twenty-five million, five hundred twenty thousand, five hundred fifty-one".