1161213481 has 8 divisors (see below), whose sum is σ = 1234933280. Its totient is φ = 1088754048.

The previous prime is 1161213479. The next prime is 1161213491. The reversal of 1161213481 is 1843121611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161213481 - 2¹ = 1161213479 is a prime.

It is a super-2 number, since 2×1161213481² = 2696833496912274722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161213421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313191 + ... + 316876.

It is an arithmetic number, because the mean of its divisors is an integer number (154366660).

Almost surely, 2^1161213481 is an apocalyptic number.

It is an amenable number.

1161213481 is a deficient number, since it is larger than the sum of its proper divisors (73719799).

1161213481 is an equidigital number, since it uses as much as digits as its factorization.

1161213481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630183.

The product of its digits is 1152, while the sum is 28.

The square root of 1161213481 is about 34076.5825898079. The cubic root of 1161213481 is about 1051.0838335411.

The spelling of 1161213481 in words is "one billion, one hundred sixty-one million, two hundred thirteen thousand, four hundred eighty-one".