1216850639 has 2 divisors, whose sum is σ = 1216850640. Its totient is φ = 1216850638.

The previous prime is 1216850629. The next prime is 1216850641. The reversal of 1216850639 is 9360586121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216850639 - 2⁴ = 1216850623 is a prime.

Together with 1216850641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216850596 and 1216850605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216850629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608425319 + 608425320.

It is an arithmetic number, because the mean of its divisors is an integer number (608425320).

Almost surely, 2^1216850639 is an apocalyptic number.

1216850639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216850639 is an equidigital number, since it uses as much as digits as its factorization.

1216850639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1216850639 is about 34883.3862891778. The cubic root of 1216850639 is about 1067.6094881548.

The spelling of 1216850639 in words is "one billion, two hundred sixteen million, eight hundred fifty thousand, six hundred thirty-nine".