1131163551 has 24 divisors (see below), whose sum is σ = 1893625344. Its totient is φ = 637272720.

The previous prime is 1131163549. The next prime is 1131163597. The reversal of 1131163551 is 1553611311.

It is a happy number.

1131163551 is a `hidden beast` number, since 1 + 13 + 11 + 635 + 5 + 1 = 666.

It is not a de Polignac number, because 1131163551 - 2¹ = 1131163549 is a prime.

It is a super-2 number, since 2×1131163551² = 2559061958221859202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131163541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121971 + ... + 130916.

It is an arithmetic number, because the mean of its divisors is an integer number (78901056).

Almost surely, 2^1131163551 is an apocalyptic number.

1131163551 is a deficient number, since it is larger than the sum of its proper divisors (762461793).

1131163551 is a wasteful number, since it uses less digits than its factorization.

1131163551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252971 (or 252968 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 1131163551 is about 33632.7749524181. The cubic root of 1131163551 is about 1041.9378167241.

Adding to 1131163551 its reverse (1553611311), we get a palindrome (2684774862).

The spelling of 1131163551 in words is "one billion, one hundred thirty-one million, one hundred sixty-three thousand, five hundred fifty-one".