131125405 has 8 divisors (see below), whose sum is σ = 157423032. Its totient is φ = 104851968.

The previous prime is 131125399. The next prime is 131125409. The reversal of 131125405 is 504521131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4 + 131125401 = 2^2 + 11451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131125405 - 2²¹ = 129028253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131125409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9537 + ... + 18793.

It is an arithmetic number, because the mean of its divisors is an integer number (19677879).

Almost surely, 2^131125405 is an apocalyptic number.

It is an amenable number.

131125405 is a deficient number, since it is larger than the sum of its proper divisors (26297627).

131125405 is an equidigital number, since it uses as much as digits as its factorization.

131125405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 131125405 is about 11451.0001746572. Note that the first 3 decimals coincide. The cubic root of 131125405 is about 508.0373174582.

Adding to 131125405 its reverse (504521131), we get a palindrome (635646536).

The spelling of 131125405 in words is "one hundred thirty-one million, one hundred twenty-five thousand, four hundred five".