1087306521 has 24 divisors (see below), whose sum is σ = 1775198880. Its totient is φ = 588615552.

The previous prime is 1087306433. The next prime is 1087306663. The reversal of 1087306521 is 1256037801.

It is not a de Polignac number, because 1087306521 - 2²⁷ = 953088793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1087306021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191856 + ... + 197441.

It is an arithmetic number, because the mean of its divisors is an integer number (73966620).

Almost surely, 2^1087306521 is an apocalyptic number.

It is an amenable number.

1087306521 is a deficient number, since it is larger than the sum of its proper divisors (687892359).

1087306521 is a wasteful number, since it uses less digits than its factorization.

1087306521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389333 (or 389326 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1087306521 is about 32974.3312441663. The cubic root of 1087306521 is about 1028.2940690121.

The spelling of 1087306521 in words is "one billion, eighty-seven million, three hundred six thousand, five hundred twenty-one".