521263961 has 8 divisors (see below), whose sum is σ = 524392704. Its totient is φ = 518143680.

The previous prime is 521263949. The next prime is 521264027. The reversal of 521263961 is 169362125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521263961 is a prime.

It is a super-2 number, since 2×521263961² = 543432234074819042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521263901) 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 7 ways as a sum of consecutive naturals, for example, 154256 + ... + 157598.

It is an arithmetic number, because the mean of its divisors is an integer number (65549088).

Almost surely, 2^521263961 is an apocalyptic number.

It is an amenable number.

521263961 is a deficient number, since it is larger than the sum of its proper divisors (3128743).

521263961 is a wasteful number, since it uses less digits than its factorization.

521263961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231.

The product of its digits is 19440, while the sum is 35.

The square root of 521263961 is about 22831.2058595248. The cubic root of 521263961 is about 804.7961681887.

The spelling of 521263961 in words is "five hundred twenty-one million, two hundred sixty-three thousand, nine hundred sixty-one".