1129863181 has 2 divisors, whose sum is σ = 1129863182. Its totient is φ = 1129863180.

The previous prime is 1129863131. The next prime is 1129863187. The reversal of 1129863181 is 1813689211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620458281 + 509404900 = 24909^2 + 22570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129863181 - 2¹³ = 1129854989 is a prime.

It is a super-2 number, since 2×1129863181² = 2553181615558877522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129863187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564931590 + 564931591.

It is an arithmetic number, because the mean of its divisors is an integer number (564931591).

Almost surely, 2^1129863181 is an apocalyptic number.

It is an amenable number.

1129863181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129863181 is an equidigital number, since it uses as much as digits as its factorization.

1129863181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 40.

The square root of 1129863181 is about 33613.4375064497. The cubic root of 1129863181 is about 1041.5383978535.

The spelling of 1129863181 in words is "one billion, one hundred twenty-nine million, eight hundred sixty-three thousand, one hundred eighty-one".