1216514263 has 4 divisors (see below), whose sum is σ = 1222627600. Its totient is φ = 1210400928.

The previous prime is 1216514261. The next prime is 1216514279. The reversal of 1216514263 is 3624156121.

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: 3624156121 = 19 ⋅190745059.

It is a cyclic number.

It is not a de Polignac number, because 1216514263 - 2¹ = 1216514261 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 (1216514261) 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, 3056370 + ... + 3056767.

It is an arithmetic number, because the mean of its divisors is an integer number (305656900).

Almost surely, 2^1216514263 is an apocalyptic number.

1216514263 is a deficient number, since it is larger than the sum of its proper divisors (6113337).

1216514263 is an equidigital number, since it uses as much as digits as its factorization.

1216514263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113336.

The product of its digits is 8640, while the sum is 31.

The square root of 1216514263 is about 34878.5645203469. The cubic root of 1216514263 is about 1067.5111054135.

The spelling of 1216514263 in words is "one billion, two hundred sixteen million, five hundred fourteen thousand, two hundred sixty-three".