1138553831 has 2 divisors, whose sum is σ = 1138553832. Its totient is φ = 1138553830.

The previous prime is 1138553813. The next prime is 1138553873. The reversal of 1138553831 is 1383558311.

It is a happy number.

Together with previous prime (1138553813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138553831 is a prime.

It is a super-2 number, since 2×1138553831² = 2592609652169553122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138543831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569276915 + 569276916.

It is an arithmetic number, because the mean of its divisors is an integer number (569276916).

Almost surely, 2^1138553831 is an apocalyptic number.

1138553831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138553831 is an equidigital number, since it uses as much as digits as its factorization.

1138553831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 1138553831 is about 33742.4633214589. The cubic root of 1138553831 is about 1044.2020054959.

The spelling of 1138553831 in words is "one billion, one hundred thirty-eight million, five hundred fifty-three thousand, eight hundred thirty-one".