125503621 has 4 divisors (see below), whose sum is σ = 125750700. Its totient is φ = 125256544.

The previous prime is 125503613. The next prime is 125503649. The reversal of 125503621 is 126305521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84364225 + 41139396 = 9185^2 + 6414^2 .

It is a cyclic number.

It is not a de Polignac number, because 125503621 - 2³ = 125503613 is a prime.

It is a super-2 number, since 2×125503621² = 31502317768223282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125503661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122776 + ... + 123793.

It is an arithmetic number, because the mean of its divisors is an integer number (31437675).

Almost surely, 2^125503621 is an apocalyptic number.

It is an amenable number.

125503621 is a deficient number, since it is larger than the sum of its proper divisors (247079).

125503621 is an equidigital number, since it uses as much as digits as its factorization.

125503621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247078.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 125503621 is about 11202.8398631776. The cubic root of 125503621 is about 500.6705948696.

The spelling of 125503621 in words is "one hundred twenty-five million, five hundred three thousand, six hundred twenty-one".