1216151653 has 4 divisors (see below), whose sum is σ = 1218790188. Its totient is φ = 1213513120.

The previous prime is 1216151647. The next prime is 1216151777. The reversal of 1216151653 is 3561516121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3561516121 = 23 ⋅154848527.

It can be written as a sum of positive squares in 2 ways, for example, as 257506209 + 958645444 = 16047^2 + 30962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216151653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216151633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1318576 + ... + 1319497.

It is an arithmetic number, because the mean of its divisors is an integer number (304697547).

Almost surely, 2^1216151653 is an apocalyptic number.

It is an amenable number.

1216151653 is a deficient number, since it is larger than the sum of its proper divisors (2638535).

1216151653 is an equidigital number, since it uses as much as digits as its factorization.

1216151653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638534.

The product of its digits is 5400, while the sum is 31.

The square root of 1216151653 is about 34873.3659545505. The cubic root of 1216151653 is about 1067.4050294771.

Adding to 1216151653 its reverse (3561516121), we get a palindrome (4777667774).

The spelling of 1216151653 in words is "one billion, two hundred sixteen million, one hundred fifty-one thousand, six hundred fifty-three".