1242641 has 2 divisors, whose sum is σ = 1242642. Its totient is φ = 1242640.

The previous prime is 1242629. The next prime is 1242643. The reversal of 1242641 is 1462421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 78400 = 1079^2 + 280^2 .

It is an emirp because it is prime and its reverse (1462421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242641 - 2¹⁴ = 1226257 is a prime.

It is a super-3 number, since 3×1242641³ = 5756497109333942163, which contains 333 as substring.

It is a Sophie Germain prime.

Together with 1242643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1242643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621320 + 621321.

It is an arithmetic number, because the mean of its divisors is an integer number (621321).

2^1242641 is an apocalyptic number.

It is an amenable number.

1242641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242641 is an equidigital number, since it uses as much as digits as its factorization.

1242641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 1242641 is about 1114.7380858300. The cubic root of 1242641 is about 107.5099251698.

The spelling of 1242641 in words is "one million, two hundred forty-two thousand, six hundred forty-one".