1213667879 has 2 divisors, whose sum is σ = 1213667880. Its totient is φ = 1213667878.

The previous prime is 1213667869. The next prime is 1213667881. The reversal of 1213667879 is 9787663121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213667879 is a prime.

Together with 1213667881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213667839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606833939 + 606833940.

It is an arithmetic number, because the mean of its divisors is an integer number (606833940).

Almost surely, 2^1213667879 is an apocalyptic number.

1213667879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213667879 is an equidigital number, since it uses as much as digits as its factorization.

1213667879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 1213667879 is about 34837.7364218745. The cubic root of 1213667879 is about 1066.6778724192.

The spelling of 1213667879 in words is "one billion, two hundred thirteen million, six hundred sixty-seven thousand, eight hundred seventy-nine".