1216052146 has 4 divisors (see below), whose sum is σ = 1824078222. Its totient is φ = 608026072.

The previous prime is 1216052129. The next prime is 1216052153. The reversal of 1216052146 is 6412506121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6412506121 = 7 ⋅916072303.

It can be written as a sum of positive squares in only one way, i.e., 711555625 + 504496521 = 26675^2 + 22461^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304013035 + ... + 304013038.

Almost surely, 2^1216052146 is an apocalyptic number.

1216052146 is a deficient number, since it is larger than the sum of its proper divisors (608026076).

1216052146 is an equidigital number, since it uses as much as digits as its factorization.

1216052146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608026075.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1216052146 is about 34871.9392348633. The cubic root of 1216052146 is about 1067.3759165593.

Adding to 1216052146 its reverse (6412506121), we get a palindrome (7628558267).

The spelling of 1216052146 in words is "one billion, two hundred sixteen million, fifty-two thousand, one hundred forty-six".