1216167013 has 4 divisors (see below), whose sum is σ = 1220003820. Its totient is φ = 1212330208.

The previous prime is 1216167011. The next prime is 1216167061. The reversal of 1216167013 is 3107616121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3107616121 = 8147 ⋅381443.

It can be written as a sum of positive squares in 2 ways, for example, as 43652449 + 1172514564 = 6607^2 + 34242^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216167013 - 2¹ = 1216167011 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 (1216167011) 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, 1917928 + ... + 1918561.

It is an arithmetic number, because the mean of its divisors is an integer number (305000955).

Almost surely, 2^1216167013 is an apocalyptic number.

It is an amenable number.

1216167013 is a deficient number, since it is larger than the sum of its proper divisors (3836807).

1216167013 is an equidigital number, since it uses as much as digits as its factorization.

1216167013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836806.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1216167013 is about 34873.5861792274. The cubic root of 1216167013 is about 1067.4095232347.

The spelling of 1216167013 in words is "one billion, two hundred sixteen million, one hundred sixty-seven thousand, thirteen".