134405025521 has 18 divisors (see below), whose sum is σ = 146119807602. Its totient is φ = 123573166080.

The previous prime is 134405025493. The next prime is 134405025539. The reversal of 134405025521 is 125520504431.

It can be written as a sum of positive squares in 9 ways, for example, as 401441296 + 134003584225 = 20036^2 + 366065^2 .

It is a de Polignac number, because none of the positive numbers 2^k-134405025521 is a prime.

It is a super-2 number, since 2×134405025521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134405025551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11156261 + ... + 11168301.

It is an arithmetic number, because the mean of its divisors is an integer number (8117767089).

Almost surely, 2^134405025521 is an apocalyptic number.

It is an amenable number.

134405025521 is a deficient number, since it is larger than the sum of its proper divisors (11714782081).

134405025521 is an equidigital number, since it uses as much as digits as its factorization.

134405025521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12581 (or 12311 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 134405025521 its reverse (125520504431), we get a palindrome (259925529952).

The spelling of 134405025521 in words is "one hundred thirty-four billion, four hundred five million, twenty-five thousand, five hundred twenty-one".