125345551 has 4 divisors (see below), whose sum is σ = 125370504. Its totient is φ = 125320600.

The previous prime is 125345501. The next prime is 125345557. The reversal of 125345551 is 155543521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155543521 = 7 ⋅22220503.

It is a cyclic number.

It is not a de Polignac number, because 125345551 - 2⁹ = 125345039 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 (125345557) 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, 2020 + ... + 15961.

It is an arithmetic number, because the mean of its divisors is an integer number (31342626).

Almost surely, 2^125345551 is an apocalyptic number.

125345551 is a deficient number, since it is larger than the sum of its proper divisors (24953).

125345551 is an equidigital number, since it uses as much as digits as its factorization.

125345551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24952.

The product of its digits is 15000, while the sum is 31.

The square root of 125345551 is about 11195.7827327972. The cubic root of 125345551 is about 500.4603107646.

The spelling of 125345551 in words is "one hundred twenty-five million, three hundred forty-five thousand, five hundred fifty-one".