1138515291 has 8 divisors (see below), whose sum is σ = 1686689360. Its totient is φ = 759010176.

The previous prime is 1138515281. The next prime is 1138515293. The reversal of 1138515291 is 1925158311.

1138515291 is a `hidden beast` number, since 1 + 138 + 515 + 2 + 9 + 1 = 666.

It is not a de Polignac number, because 1138515291 - 2⁹ = 1138514779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138515293) 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, 21083590 + ... + 21083643.

It is an arithmetic number, because the mean of its divisors is an integer number (210836170).

Almost surely, 2^1138515291 is an apocalyptic number.

1138515291 is a deficient number, since it is larger than the sum of its proper divisors (548174069).

1138515291 is an equidigital number, since it uses as much as digits as its factorization.

1138515291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42167242 (or 42167236 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 1138515291 is about 33741.8922261334. The cubic root of 1138515291 is about 1044.1902232981.

The spelling of 1138515291 in words is "one billion, one hundred thirty-eight million, five hundred fifteen thousand, two hundred ninety-one".