521071097 has 4 divisors (see below), whose sum is σ = 551722356. Its totient is φ = 490419840.

The previous prime is 521071087. The next prime is 521071139. The reversal of 521071097 is 790170125.

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 203376121 + 317694976 = 14261^2 + 17824^2 .

It is a cyclic number.

It is not a de Polignac number, because 521071097 - 2⁴ = 521071081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521071087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15325604 + ... + 15325637.

It is an arithmetic number, because the mean of its divisors is an integer number (137930589).

Almost surely, 2^521071097 is an apocalyptic number.

It is an amenable number.

521071097 is a deficient number, since it is larger than the sum of its proper divisors (30651259).

521071097 is a wasteful number, since it uses less digits than its factorization.

521071097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30651258.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 521071097 is about 22826.9817759598. The cubic root of 521071097 is about 804.6968996372.

The spelling of 521071097 in words is "five hundred twenty-one million, seventy-one thousand, ninety-seven".