521346861 has 40 divisors (see below), whose sum is σ = 895678784. Its totient is φ = 296032320.

The previous prime is 521346851. The next prime is 521346863. The reversal of 521346861 is 168643125.

It is a happy number.

It is not a de Polignac number, because 521346861 - 2⁷ = 521346733 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521346863) 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 39 ways as a sum of consecutive naturals, for example, 89601 + ... + 95241.

Almost surely, 2^521346861 is an apocalyptic number.

It is an amenable number.

521346861 is a deficient number, since it is larger than the sum of its proper divisors (374331923).

521346861 is a wasteful number, since it uses less digits than its factorization.

521346861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823 (or 5814 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 521346861 is about 22833.0212849723. The cubic root of 521346861 is about 804.8388299179.

Adding to 521346861 its reverse (168643125), we get a palindrome (689989986).

The spelling of 521346861 in words is "five hundred twenty-one million, three hundred forty-six thousand, eight hundred sixty-one".