1087521409 has 4 divisors (see below), whose sum is σ = 1171176916. Its totient is φ = 1003865904.

The previous prime is 1087521403. The next prime is 1087521419. The reversal of 1087521409 is 9041257801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9041257801 = 61 ⋅148217341.

It can be written as a sum of positive squares in 2 ways, for example, as 578883600 + 508637809 = 24060^2 + 22553^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087521409 - 2³ = 1087521401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1087521401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41827734 + ... + 41827759.

It is an arithmetic number, because the mean of its divisors is an integer number (292794229).

Almost surely, 2^1087521409 is an apocalyptic number.

It is an amenable number.

1087521409 is a deficient number, since it is larger than the sum of its proper divisors (83655507).

1087521409 is an equidigital number, since it uses as much as digits as its factorization.

1087521409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83655506.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1087521409 is about 32977.5894965050. The cubic root of 1087521409 is about 1028.3618062743.

The spelling of 1087521409 in words is "one billion, eighty-seven million, five hundred twenty-one thousand, four hundred nine".