1138525891 has 8 divisors (see below), whose sum is σ = 1158534000. Its totient is φ = 1118541600.

The previous prime is 1138525879. The next prime is 1138525901. The reversal of 1138525891 is 1985258311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138525891 - 2⁵ = 1138525859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138525811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110041 + ... + 119941.

It is an arithmetic number, because the mean of its divisors is an integer number (144816750).

Almost surely, 2^1138525891 is an apocalyptic number.

1138525891 is a deficient number, since it is larger than the sum of its proper divisors (20008109).

1138525891 is an equidigital number, since it uses as much as digits as its factorization.

1138525891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11909.

The product of its digits is 86400, while the sum is 43.

The square root of 1138525891 is about 33742.0493005389. The cubic root of 1138525891 is about 1044.1934638876.

The spelling of 1138525891 in words is "one billion, one hundred thirty-eight million, five hundred twenty-five thousand, eight hundred ninety-one".