125132231521 has 4 divisors (see below), whose sum is σ = 136507888944. Its totient is φ = 113756574100.

The previous prime is 125132231519. The next prime is 125132231533.

125132231521 is nontrivially palindromic in base 10.

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 125132231521 - 2¹ = 125132231519 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 125132231521.

It is not an unprimeable number, because it can be changed into a prime (125132231821) 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, 5687828695 + ... + 5687828716.

It is an arithmetic number, because the mean of its divisors is an integer number (34126972236).

Almost surely, 2^125132231521 is an apocalyptic number.

125132231521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125132231521 is a deficient number, since it is larger than the sum of its proper divisors (11375657423).

125132231521 is a wasteful number, since it uses less digits than its factorization.

125132231521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11375657422.

The product of its digits is 3600, while the sum is 28.

It can be divided in two parts, 125132 and 231521, that added together give a palindrome (356653).

The spelling of 125132231521 in words is "one hundred twenty-five billion, one hundred thirty-two million, two hundred thirty-one thousand, five hundred twenty-one".