1115721151 has 4 divisors (see below), whose sum is σ = 1142933904. Its totient is φ = 1088508400.

The previous prime is 1115721133. The next prime is 1115721157. The reversal of 1115721151 is 1511275111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1511275111 = 1579 ⋅957109.

It is a cyclic number.

It is not a de Polignac number, because 1115721151 - 2⁷ = 1115721023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115721157) 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, 13606315 + ... + 13606396.

It is an arithmetic number, because the mean of its divisors is an integer number (285733476).

Almost surely, 2^1115721151 is an apocalyptic number.

1115721151 is a deficient number, since it is larger than the sum of its proper divisors (27212753).

1115721151 is an equidigital number, since it uses as much as digits as its factorization.

1115721151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27212752.

The product of its digits is 350, while the sum is 25.

The square root of 1115721151 is about 33402.4123530023. The cubic root of 1115721151 is about 1037.1746386940.

Adding to 1115721151 its reverse (1511275111), we get a palindrome (2626996262).

The spelling of 1115721151 in words is "one billion, one hundred fifteen million, seven hundred twenty-one thousand, one hundred fifty-one".