521311161451 has 4 divisors (see below), whose sum is σ = 528452410312. Its totient is φ = 514169912592.

The previous prime is 521311161439. The next prime is 521311161467. The reversal of 521311161451 is 154161113125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521311161451 - 2²⁷ = 521176943723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521311161491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570624321 + ... + 3570624466.

It is an arithmetic number, because the mean of its divisors is an integer number (132113102578).

Almost surely, 2^521311161451 is an apocalyptic number.

521311161451 is a deficient number, since it is larger than the sum of its proper divisors (7141248861).

521311161451 is an equidigital number, since it uses as much as digits as its factorization.

521311161451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141248860.

The product of its digits is 3600, while the sum is 31.

Adding to 521311161451 its reverse (154161113125), we get a palindrome (675472274576).

The spelling of 521311161451 in words is "five hundred twenty-one billion, three hundred eleven million, one hundred sixty-one thousand, four hundred fifty-one".