1216161452 has 12 divisors (see below), whose sum is σ = 2321762856. Its totient is φ = 552800640.

The previous prime is 1216161449. The next prime is 1216161461. The reversal of 1216161452 is 2541616121.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13819973 + ... + 13820060.

It is an arithmetic number, because the mean of its divisors is an integer number (193480238).

Almost surely, 2^1216161452 is an apocalyptic number.

It is an amenable number.

1216161452 is a deficient number, since it is larger than the sum of its proper divisors (1105601404).

1216161452 is a wasteful number, since it uses less digits than its factorization.

1216161452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27640048 (or 27640046 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1216161452 is about 34873.5064483054. The cubic root of 1216161452 is about 1067.4078962999.

Adding to 1216161452 its reverse (2541616121), we get a palindrome (3757777573).

The spelling of 1216161452 in words is "one billion, two hundred sixteen million, one hundred sixty-one thousand, four hundred fifty-two".