521661106 has 8 divisors (see below), whose sum is σ = 809474220. Its totient is φ = 251836368.

The previous prime is 521661097. The next prime is 521661121. The reversal of 521661106 is 601166125.

It can be written as a sum of positive squares in 2 ways, for example, as 479215881 + 42445225 = 21891^2 + 6515^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4497021 + ... + 4497136.

Almost surely, 2^521661106 is an apocalyptic number.

521661106 is a deficient number, since it is larger than the sum of its proper divisors (287813114).

521661106 is a wasteful number, since it uses less digits than its factorization.

521661106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8994188.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 521661106 is about 22839.9016197531. The cubic root of 521661106 is about 805.0005046098. Note that the first 3 decimals are identical.

The spelling of 521661106 in words is "five hundred twenty-one million, six hundred sixty-one thousand, one hundred six".