1218922877 has 2 divisors, whose sum is σ = 1218922878. Its totient is φ = 1218922876.

The previous prime is 1218922871. The next prime is 1218922879. The reversal of 1218922877 is 7782298121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687435961 + 531486916 = 26219^2 + 23054^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218922877 - 2²² = 1214728573 is a prime.

Together with 1218922879, 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 (1218922871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609461438 + 609461439.

It is an arithmetic number, because the mean of its divisors is an integer number (609461439).

Almost surely, 2^1218922877 is an apocalyptic number.

It is an amenable number.

1218922877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218922877 is an equidigital number, since it uses as much as digits as its factorization.

1218922877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 47.

The square root of 1218922877 is about 34913.0760174465. The cubic root of 1218922877 is about 1068.2151736377.

The spelling of 1218922877 in words is "one billion, two hundred eighteen million, nine hundred twenty-two thousand, eight hundred seventy-seven".