1131320651 has 4 divisors (see below), whose sum is σ = 1133484312. Its totient is φ = 1129156992.

The previous prime is 1131320623. The next prime is 1131320681. The reversal of 1131320651 is 1560231311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1560231311 = 251 ⋅6216061.

It is a cyclic number.

It is not a de Polignac number, because 1131320651 - 2¹⁸ = 1131058507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131320611) 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, 1081046 + ... + 1082091.

It is an arithmetic number, because the mean of its divisors is an integer number (283371078).

Almost surely, 2^1131320651 is an apocalyptic number.

1131320651 is a deficient number, since it is larger than the sum of its proper divisors (2163661).

1131320651 is an equidigital number, since it uses as much as digits as its factorization.

1131320651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163660.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1131320651 is about 33635.1103907806. The cubic root of 1131320651 is about 1041.9860504958.

Adding to 1131320651 its reverse (1560231311), we get a palindrome (2691551962).

The spelling of 1131320651 in words is "one billion, one hundred thirty-one million, three hundred twenty thousand, six hundred fifty-one".