1216237673 has 6 divisors (see below), whose sum is σ = 1414807146. Its totient is φ = 1042489392.

The previous prime is 1216237669. The next prime is 1216237697. The reversal of 1216237673 is 3767326121.

It can be written as a sum of positive squares in only one way, i.e., 1215707689 + 529984 = 34867^2 + 728^2 .

It is not a de Polignac number, because 1216237673 - 2² = 1216237669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216237643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12410540 + ... + 12410637.

It is an arithmetic number, because the mean of its divisors is an integer number (235801191).

Almost surely, 2^1216237673 is an apocalyptic number.

It is an amenable number.

1216237673 is a deficient number, since it is larger than the sum of its proper divisors (198569473).

1216237673 is an equidigital number, since it uses as much as digits as its factorization.

1216237673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24821191 (or 24821184 counting only the distinct ones).

The product of its digits is 63504, while the sum is 38.

The square root of 1216237673 is about 34874.5992521778. The cubic root of 1216237673 is about 1067.4301952026.

The spelling of 1216237673 in words is "one billion, two hundred sixteen million, two hundred thirty-seven thousand, six hundred seventy-three".