521725061401 has 4 divisors (see below), whose sum is σ = 521729266212. Its totient is φ = 521720856592.

The previous prime is 521725061393. The next prime is 521725061419. The reversal of 521725061401 is 104160527125.

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 389301123600 + 132423937801 = 623940^2 + 363901^2 .

It is a cyclic number.

It is not a de Polignac number, because 521725061401 - 2³ = 521725061393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521725061101) 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, 1910446 + ... + 2166391.

It is an arithmetic number, because the mean of its divisors is an integer number (130432316553).

Almost surely, 2^521725061401 is an apocalyptic number.

It is an amenable number.

521725061401 is a deficient number, since it is larger than the sum of its proper divisors (4204811).

521725061401 is a wasteful number, since it uses less digits than its factorization.

521725061401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4204810.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 521725061401 its reverse (104160527125), we get a palindrome (625885588526).

The spelling of 521725061401 in words is "five hundred twenty-one billion, seven hundred twenty-five million, sixty-one thousand, four hundred one".