1138577831 has 16 divisors (see below), whose sum is σ = 1234259040. Its totient is φ = 1046753280.

The previous prime is 1138577789. The next prime is 1138577837. The reversal of 1138577831 is 1387758311.

It is a cyclic number.

It is not a de Polignac number, because 1138577831 - 2¹⁰ = 1138576807 is a prime.

It is a super-2 number, since 2×1138577831² = 2592718954489329122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138577837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146561 + ... + 154133.

It is an arithmetic number, because the mean of its divisors is an integer number (77141190).

Almost surely, 2^1138577831 is an apocalyptic number.

1138577831 is a deficient number, since it is larger than the sum of its proper divisors (95681209).

1138577831 is a wasteful number, since it uses less digits than its factorization.

1138577831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7826.

The product of its digits is 141120, while the sum is 44.

The square root of 1138577831 is about 33742.8189545568. The cubic root of 1138577831 is about 1044.2093424853.

The spelling of 1138577831 in words is "one billion, one hundred thirty-eight million, five hundred seventy-seven thousand, eight hundred thirty-one".