125245551 has 4 divisors (see below), whose sum is σ = 166994072. Its totient is φ = 83497032.

The previous prime is 125245501. The next prime is 125245607. The reversal of 125245551 is 155542521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155542521 = 3 ⋅51847507.

It is a de Polignac number, because none of the positive numbers 2^k-125245551 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 (125245501) 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, 20874256 + ... + 20874261.

It is an arithmetic number, because the mean of its divisors is an integer number (41748518).

Almost surely, 2^125245551 is an apocalyptic number.

125245551 is a deficient number, since it is larger than the sum of its proper divisors (41748521).

125245551 is an equidigital number, since it uses as much as digits as its factorization.

125245551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41748520.

The product of its digits is 10000, while the sum is 30.

The square root of 125245551 is about 11191.3158743733. The cubic root of 125245551 is about 500.3271871837.

The spelling of 125245551 in words is "one hundred twenty-five million, two hundred forty-five thousand, five hundred fifty-one".