1218922853 has 2 divisors, whose sum is σ = 1218922854. Its totient is φ = 1218922852.

The previous prime is 1218922841. The next prime is 1218922871. The reversal of 1218922853 is 3582298121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994582369 + 224340484 = 31537^2 + 14978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218922853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218922853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218922753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609461426 + 609461427.

It is an arithmetic number, because the mean of its divisors is an integer number (609461427).

Almost surely, 2^1218922853 is an apocalyptic number.

It is an amenable number.

1218922853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218922853 is an equidigital number, since it uses as much as digits as its factorization.

1218922853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 1218922853 is about 34913.0756737358. The cubic root of 1218922853 is about 1068.2151666268.

The spelling of 1218922853 in words is "one billion, two hundred eighteen million, nine hundred twenty-two thousand, eight hundred fifty-three".