1216054263 has 4 divisors (see below), whose sum is σ = 1621405688. Its totient is φ = 810702840.

The previous prime is 1216054253. The next prime is 1216054271. The reversal of 1216054263 is 3624506121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3624506121 = 3 ⋅1208168707.

It is not a de Polignac number, because 1216054263 - 2¹² = 1216050167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216054263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216054223) 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, 202675708 + ... + 202675713.

It is an arithmetic number, because the mean of its divisors is an integer number (405351422).

Almost surely, 2^1216054263 is an apocalyptic number.

1216054263 is a deficient number, since it is larger than the sum of its proper divisors (405351425).

1216054263 is an equidigital number, since it uses as much as digits as its factorization.

1216054263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405351424.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1216054263 is about 34871.9695887686. The cubic root of 1216054263 is about 1067.3765359498.

The spelling of 1216054263 in words is "one billion, two hundred sixteen million, fifty-four thousand, two hundred sixty-three".