1162918721 has 4 divisors (see below), whose sum is σ = 1163720532. Its totient is φ = 1162116912.

The previous prime is 1162918681. The next prime is 1162918817. The reversal of 1162918721 is 1278192611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1278192611 = 103 ⋅12409637.

It can be written as a sum of positive squares in 2 ways, for example, as 1065304321 + 97614400 = 32639^2 + 9880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1162918721 - 2³⁰ = 89176897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1162911721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398726 + ... + 401631.

It is an arithmetic number, because the mean of its divisors is an integer number (290930133).

Almost surely, 2^1162918721 is an apocalyptic number.

It is an amenable number.

1162918721 is a deficient number, since it is larger than the sum of its proper divisors (801811).

1162918721 is an equidigital number, since it uses as much as digits as its factorization.

1162918721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801810.

The product of its digits is 12096, while the sum is 38.

The square root of 1162918721 is about 34101.5941122992. The cubic root of 1162918721 is about 1051.5980868305.

The spelling of 1162918721 in words is "one billion, one hundred sixty-two million, nine hundred eighteen thousand, seven hundred twenty-one".