1242181 has 2 divisors, whose sum is σ = 1242182. Its totient is φ = 1242180.

The previous prime is 1242169. The next prime is 1242191. The reversal of 1242181 is 1812421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982081 + 260100 = 991^2 + 510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242181 is a prime.

It is a super-2 number, since 2×1242181² = 3086027273522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621090 + 621091.

It is an arithmetic number, because the mean of its divisors is an integer number (621091).

2^1242181 is an apocalyptic number.

It is an amenable number.

1242181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242181 is an equidigital number, since it uses as much as digits as its factorization.

1242181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 19.

The square root of 1242181 is about 1114.5317402389. The cubic root of 1242181 is about 107.4966575489.

The spelling of 1242181 in words is "one million, two hundred forty-two thousand, one hundred eighty-one".