1138566887 has 4 divisors (see below), whose sum is σ = 1198491480. Its totient is φ = 1078642296.

The previous prime is 1138566827. The next prime is 1138566893. The reversal of 1138566887 is 7886658311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1138566887 - 2¹² = 1138562791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138566817) 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, 29962268 + ... + 29962305.

It is an arithmetic number, because the mean of its divisors is an integer number (299622870).

Almost surely, 2^1138566887 is an apocalyptic number.

1138566887 is a deficient number, since it is larger than the sum of its proper divisors (59924593).

1138566887 is an equidigital number, since it uses as much as digits as its factorization.

1138566887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59924592.

The product of its digits is 1935360, while the sum is 53.

The square root of 1138566887 is about 33742.6567863291. The cubic root of 1138566887 is about 1044.2059968309.

The spelling of 1138566887 in words is "one billion, one hundred thirty-eight million, five hundred sixty-six thousand, eight hundred eighty-seven".