125545021 has 4 divisors (see below), whose sum is σ = 143480032. Its totient is φ = 107610012.

The previous prime is 125544977. The next prime is 125545061. The reversal of 125545021 is 120545521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125545021 - 2¹⁵ = 125512253 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 (125545061) 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, 8967495 + ... + 8967508.

It is an arithmetic number, because the mean of its divisors is an integer number (35870008).

Almost surely, 2^125545021 is an apocalyptic number.

It is an amenable number.

125545021 is a deficient number, since it is larger than the sum of its proper divisors (17935011).

125545021 is an equidigital number, since it uses as much as digits as its factorization.

125545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17935010.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 125545021 is about 11204.6874565960. The cubic root of 125545021 is about 500.7256410474.

The spelling of 125545021 in words is "one hundred twenty-five million, five hundred forty-five thousand, twenty-one".