521167447261 has 4 divisors (see below), whose sum is σ = 521397139900. Its totient is φ = 520937754624.

The previous prime is 521167447259. The next prime is 521167447291. The reversal of 521167447261 is 162744761125.

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 32574835225 + 488592612036 = 180485^2 + 698994^2 .

It is a cyclic number.

It is not a de Polignac number, because 521167447261 - 2¹ = 521167447259 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 (521167447201) 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, 114842916 + ... + 114847453.

It is an arithmetic number, because the mean of its divisors is an integer number (130349284975).

Almost surely, 2^521167447261 is an apocalyptic number.

It is an amenable number.

521167447261 is a deficient number, since it is larger than the sum of its proper divisors (229692639).

521167447261 is a wasteful number, since it uses less digits than its factorization.

521167447261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229692638.

The product of its digits is 564480, while the sum is 46.

The spelling of 521167447261 in words is "five hundred twenty-one billion, one hundred sixty-seven million, four hundred forty-seven thousand, two hundred sixty-one".