125506551 has 16 divisors (see below), whose sum is σ = 171801344. Its totient is φ = 81454464.

The previous prime is 125506547. The next prime is 125506559. The reversal of 125506551 is 155605521.

It is not a de Polignac number, because 125506551 - 2² = 125506547 is a prime.

It is a super-4 number, since 4×125506551⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125506559) 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 15 ways as a sum of consecutive naturals, for example, 42030 + ... + 44916.

It is an arithmetic number, because the mean of its divisors is an integer number (10737584).

Almost surely, 2^125506551 is an apocalyptic number.

125506551 is a deficient number, since it is larger than the sum of its proper divisors (46294793).

125506551 is a wasteful number, since it uses less digits than its factorization.

125506551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 125506551 is about 11202.9706328277. The cubic root of 125506551 is about 500.6744910479.

The spelling of 125506551 in words is "one hundred twenty-five million, five hundred six thousand, five hundred fifty-one".