1138455081 has 45 divisors (see below), whose sum is σ = 1788785229. Its totient is φ = 721517544.

The previous prime is 1138455079. The next prime is 1138455113. The reversal of 1138455081 is 1805548311.

The square root of 1138455081 is 33741.

It is a perfect power (a square), and thus also a powerful number.

1138455081 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1138455081 - 2¹ = 1138455079 is a prime.

It is a super-2 number, since 2×1138455081² = 2592159942909433122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1138455061) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6984306 + ... + 6984468.

Almost surely, 2^1138455081 is an apocalyptic number.

1138455081 is the 33741-st square number.

1138455081 is the 16871-st centered octagonal number.

It is an amenable number.

1138455081 is a deficient number, since it is larger than the sum of its proper divisors (650330148).

1138455081 is an frugal number, since it uses more digits than its factorization.

1138455081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The cubic root of 1138455081 is about 1044.1718157568.

Multiplying 1138455081 by its sum of digits (36), we get a square (40984382916 = 202446²).

The spelling of 1138455081 in words is "one billion, one hundred thirty-eight million, four hundred fifty-five thousand, eighty-one".