1151242271 has 4 divisors (see below), whose sum is σ = 1158866544. Its totient is φ = 1143618000.

The previous prime is 1151242249. The next prime is 1151242291. The reversal of 1151242271 is 1722421511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1722421511 = 233 ⋅7392367.

It is a cyclic number.

It is not a de Polignac number, because 1151242271 - 2³⁰ = 77500447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1151242271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151242201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3811910 + ... + 3812211.

It is an arithmetic number, because the mean of its divisors is an integer number (289716636).

Almost surely, 2^1151242271 is an apocalyptic number.

1151242271 is a deficient number, since it is larger than the sum of its proper divisors (7624273).

1151242271 is an equidigital number, since it uses as much as digits as its factorization.

1151242271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624272.

The product of its digits is 1120, while the sum is 26.

The square root of 1151242271 is about 33929.9612584512. The cubic root of 1151242271 is about 1048.0666679492.

Adding to 1151242271 its reverse (1722421511), we get a palindrome (2873663782).

The spelling of 1151242271 in words is "one billion, one hundred fifty-one million, two hundred forty-two thousand, two hundred seventy-one".