521970086 has 16 divisors (see below), whose sum is σ = 858911040. Its totient is φ = 235931880.

The previous prime is 521970067. The next prime is 521970089. The reversal of 521970086 is 680079125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521970089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62336 + ... + 70211.

It is an arithmetic number, because the mean of its divisors is an integer number (53681940).

Almost surely, 2^521970086 is an apocalyptic number.

521970086 is a deficient number, since it is larger than the sum of its proper divisors (336940954).

521970086 is a wasteful number, since it uses less digits than its factorization.

521970086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132739.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 521970086 is about 22846.6646581071. The cubic root of 521970086 is about 805.1594072395.

The spelling of 521970086 in words is "five hundred twenty-one million, nine hundred seventy thousand, eighty-six".