1218901 has 2 divisors, whose sum is σ = 1218902. Its totient is φ = 1218900.

The previous prime is 1218859. The next prime is 1218911. The reversal of 1218901 is 1098121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998001 + 220900 = 999^2 + 470^2 .

It is an emirp because it is prime and its reverse (1098121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218901 - 2⁷ = 1218773 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609450 + 609451.

It is an arithmetic number, because the mean of its divisors is an integer number (609451).

2^1218901 is an apocalyptic number.

It is an amenable number.

1218901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218901 is an equidigital number, since it uses as much as digits as its factorization.

1218901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1218901 is about 1104.0384957057. The cubic root of 1218901 is about 106.8208782891.

The spelling of 1218901 in words is "one million, two hundred eighteen thousand, nine hundred one".