125509451 has 4 divisors (see below), whose sum is σ = 125730600. Its totient is φ = 125288304.

The previous prime is 125509441. The next prime is 125509457. The reversal of 125509451 is 154905521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154905521 = 2953 ⋅52457.

It is a cyclic number.

It is not a de Polignac number, because 125509451 - 2⁶ = 125509387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125509457) 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, 109721 + ... + 110858.

It is an arithmetic number, because the mean of its divisors is an integer number (31432650).

Almost surely, 2^125509451 is an apocalyptic number.

125509451 is a deficient number, since it is larger than the sum of its proper divisors (221149).

125509451 is an equidigital number, since it uses as much as digits as its factorization.

125509451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221148.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 125509451 is about 11203.1000620364. The cubic root of 125509451 is about 500.6783472738.

The spelling of 125509451 in words is "one hundred twenty-five million, five hundred nine thousand, four hundred fifty-one".