125521403 has 4 divisors (see below), whose sum is σ = 143453040. Its totient is φ = 107589768.

The previous prime is 125521393. The next prime is 125521411. The reversal of 125521403 is 304125521.

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

It is a cyclic number.

It is not a de Polignac number, because 125521403 - 2¹⁰ = 125520379 is a prime.

It is a super-2 number, since 2×125521403² = 31511245222176818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125521433) 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, 8965808 + ... + 8965821.

It is an arithmetic number, because the mean of its divisors is an integer number (35863260).

Almost surely, 2^125521403 is an apocalyptic number.

125521403 is a deficient number, since it is larger than the sum of its proper divisors (17931637).

125521403 is an equidigital number, since it uses as much as digits as its factorization.

125521403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17931636.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 125521403 is about 11203.6334731193. The cubic root of 125521403 is about 500.6942396166.

Adding to 125521403 its reverse (304125521), we get a palindrome (429646924).

The spelling of 125521403 in words is "one hundred twenty-five million, five hundred twenty-one thousand, four hundred three".