1163291085 has 32 divisors (see below), whose sum is σ = 2256082560. Its totient is φ = 564019200.

The previous prime is 1163291081. The next prime is 1163291099. The reversal of 1163291085 is 5801923611.

1163291085 is a `hidden beast` number, since 1 + 1 + 632 + 9 + 10 + 8 + 5 = 666.

It is not a de Polignac number, because 1163291085 - 2² = 1163291081 is a prime.

It is a super-2 number, since 2×1163291085² = 2706492296880954450, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163291081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390196 + ... + 393165.

It is an arithmetic number, because the mean of its divisors is an integer number (70502580).

Almost surely, 2^1163291085 is an apocalyptic number.

1163291085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1163291085 is a deficient number, since it is larger than the sum of its proper divisors (1092791475).

1163291085 is a wasteful number, since it uses less digits than its factorization.

1163291085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783386 (or 783380 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1163291085 is about 34107.0533027994. The cubic root of 1163291085 is about 1051.7103146461.

The spelling of 1163291085 in words is "one billion, one hundred sixty-three million, two hundred ninety-one thousand, eighty-five".