521087091 has 16 divisors (see below), whose sum is σ = 819652608. Its totient is φ = 288158400.

The previous prime is 521087089. The next prime is 521087093. The reversal of 521087091 is 190780125.

It is an interprime number because it is at equal distance from previous prime (521087089) and next prime (521087093).

It is not a de Polignac number, because 521087091 - 2¹ = 521087089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521087093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399570 + ... + 400871.

It is an arithmetic number, because the mean of its divisors is an integer number (51228288).

Almost surely, 2^521087091 is an apocalyptic number.

521087091 is a deficient number, since it is larger than the sum of its proper divisors (298565517).

521087091 is a wasteful number, since it uses less digits than its factorization.

521087091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800482.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 521087091 is about 22827.3321042999. The cubic root of 521087091 is about 804.7051328007.

The spelling of 521087091 in words is "five hundred twenty-one million, eighty-seven thousand, ninety-one".