125141442521 has 4 divisors (see below), whose sum is σ = 125142203700. Its totient is φ = 125140681344.

The previous prime is 125141442511. The next prime is 125141442523. The reversal of 125141442521 is 125244141521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4148776921 + 120992665600 = 64411^2 + 347840^2 .

It is a cyclic number.

It is not a de Polignac number, because 125141442521 - 2¹⁸ = 125141180377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125141442523) 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, 20276 + ... + 500693.

It is an arithmetic number, because the mean of its divisors is an integer number (31285550925).

Almost surely, 2^125141442521 is an apocalyptic number.

It is an amenable number.

125141442521 is a deficient number, since it is larger than the sum of its proper divisors (761179).

125141442521 is an equidigital number, since it uses as much as digits as its factorization.

125141442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761178.

The product of its digits is 12800, while the sum is 32.

The spelling of 125141442521 in words is "one hundred twenty-five billion, one hundred forty-one million, four hundred forty-two thousand, five hundred twenty-one".