1163721853 has 4 divisors (see below), whose sum is σ = 1329967840. Its totient is φ = 997475868.

The previous prime is 1163721851. The next prime is 1163721883. The reversal of 1163721853 is 3581273611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3581273611 = 1033 ⋅3466867.

It is a cyclic number.

It is not a de Polignac number, because 1163721853 - 2¹ = 1163721851 is a prime.

It is a super-2 number, since 2×1163721853² = 2708497102299507218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163721851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83122983 + ... + 83122996.

It is an arithmetic number, because the mean of its divisors is an integer number (332491960).

Almost surely, 2^1163721853 is an apocalyptic number.

It is an amenable number.

1163721853 is a deficient number, since it is larger than the sum of its proper divisors (166245987).

1163721853 is an equidigital number, since it uses as much as digits as its factorization.

1163721853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166245986.

The product of its digits is 30240, while the sum is 37.

The square root of 1163721853 is about 34113.3676584415. The cubic root of 1163721853 is about 1051.8401151307.

The spelling of 1163721853 in words is "one billion, one hundred sixty-three million, seven hundred twenty-one thousand, eight hundred fifty-three".