125566451 has 4 divisors (see below), whose sum is σ = 126977400. Its totient is φ = 124155504.

The previous prime is 125566439. The next prime is 125566489. The reversal of 125566451 is 154665521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154665521 = 103 ⋅1501607.

It is a cyclic number.

It is not a de Polignac number, because 125566451 - 2⁶ = 125566387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125566951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705341 + ... + 705518.

It is an arithmetic number, because the mean of its divisors is an integer number (31744350).

Almost surely, 2^125566451 is an apocalyptic number.

125566451 is a deficient number, since it is larger than the sum of its proper divisors (1410949).

125566451 is an equidigital number, since it uses as much as digits as its factorization.

125566451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410948.

The product of its digits is 36000, while the sum is 35.

The square root of 125566451 is about 11205.6437119873. The cubic root of 125566451 is about 500.7541300040.

The spelling of 125566451 in words is "one hundred twenty-five million, five hundred sixty-six thousand, four hundred fifty-one".