1212636673 has 16 divisors (see below), whose sum is σ = 1302318864. Its totient is φ = 1125089280.

The previous prime is 1212636647. The next prime is 1212636709. The reversal of 1212636673 is 3766362121.

It can be written as a sum of positive squares in 8 ways, for example, as 306145009 + 906491664 = 17497^2 + 30108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212636673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212636643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462061 + ... + 464677.

It is an arithmetic number, because the mean of its divisors is an integer number (81394929).

Almost surely, 2^1212636673 is an apocalyptic number.

It is an amenable number.

1212636673 is a deficient number, since it is larger than the sum of its proper divisors (89682191).

1212636673 is a wasteful number, since it uses less digits than its factorization.

1212636673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

The product of its digits is 54432, while the sum is 37.

The square root of 1212636673 is about 34822.9331475681. The cubic root of 1212636673 is about 1066.3756820312.

Adding to 1212636673 its reverse (3766362121), we get a palindrome (4978998794).

It can be divided in two parts, 1212 and 636673, that added together give a triangular number (637885 = T₁₁₂₉).

The spelling of 1212636673 in words is "one billion, two hundred twelve million, six hundred thirty-six thousand, six hundred seventy-three".