125121603 has 4 divisors (see below), whose sum is σ = 166828808. Its totient is φ = 83414400.

The previous prime is 125121599. The next prime is 125121643. The reversal of 125121603 is 306121521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 125121603 - 2² = 125121599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125121603.

It is not an unprimeable number, because it can be changed into a prime (125121643) 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, 20853598 + ... + 20853603.

It is an arithmetic number, because the mean of its divisors is an integer number (41707202).

Almost surely, 2^125121603 is an apocalyptic number.

125121603 is a deficient number, since it is larger than the sum of its proper divisors (41707205).

125121603 is an equidigital number, since it uses as much as digits as its factorization.

125121603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41707204.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 125121603 is about 11185.7768170119. The cubic root of 125121603 is about 500.1620847847.

The spelling of 125121603 in words is "one hundred twenty-five million, one hundred twenty-one thousand, six hundred three".