11571438487 has 16 divisors (see below), whose sum is σ = 13585545792. Its totient is φ = 9648967680.

The previous prime is 11571438481. The next prime is 11571438511. The reversal of 11571438487 is 78483417511.

It is a cyclic number.

It is not a de Polignac number, because 11571438487 - 2¹⁵ = 11571405719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11571438487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11571438481) 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, 44203 + ... + 158419.

It is an arithmetic number, because the mean of its divisors is an integer number (849096612).

Almost surely, 2^11571438487 is an apocalyptic number.

11571438487 is a deficient number, since it is larger than the sum of its proper divisors (2014107305).

11571438487 is a wasteful number, since it uses less digits than its factorization.

11571438487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114618.

The product of its digits is 752640, while the sum is 49.

The spelling of 11571438487 in words is "eleven billion, five hundred seventy-one million, four hundred thirty-eight thousand, four hundred eighty-seven".