1216154452 has 6 divisors (see below), whose sum is σ = 2128270298. Its totient is φ = 608077224.

The previous prime is 1216154447. The next prime is 1216154497. The reversal of 1216154452 is 2544516121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1202286276 + 13868176 = 34674^2 + 3724^2 .

It is a super-2 number, since 2×1216154452² = 2958063302238840608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152019303 + ... + 152019310.

Almost surely, 2^1216154452 is an apocalyptic number.

It is an amenable number.

1216154452 is a deficient number, since it is larger than the sum of its proper divisors (912115846).

1216154452 is a wasteful number, since it uses less digits than its factorization.

1216154452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304038617 (or 304038615 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 1216154452 is about 34873.4060854399. The cubic root of 1216154452 is about 1067.4058483619.

The spelling of 1216154452 in words is "one billion, two hundred sixteen million, one hundred fifty-four thousand, four hundred fifty-two".