1165421036 has 24 divisors (see below), whose sum is σ = 2212185360. Its totient is φ = 534013632.

The previous prime is 1165421027. The next prime is 1165421039. The reversal of 1165421036 is 6301245611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1165421039) 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, 73391 + ... + 87846.

It is an arithmetic number, because the mean of its divisors is an integer number (92174390).

Almost surely, 2^1165421036 is an apocalyptic number.

It is an amenable number.

1165421036 is a deficient number, since it is larger than the sum of its proper divisors (1046764324).

1165421036 is a wasteful number, since it uses less digits than its factorization.

1165421036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161393 (or 161391 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1165421036 is about 34138.2635176425. The cubic root of 1165421036 is about 1052.3518066092.

Adding to 1165421036 its reverse (6301245611), we get a palindrome (7466666647).

The spelling of 1165421036 in words is "one billion, one hundred sixty-five million, four hundred twenty-one thousand, thirty-six".