1201643 has 2 divisors, whose sum is σ = 1201644. Its totient is φ = 1201642.

The previous prime is 1201637. The next prime is 1201687. The reversal of 1201643 is 3461021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201643 - 2²⁰ = 153067 is a prime.

It is a Sophie Germain prime.

It is equal to p₉₃₀₅₀ and since 1201643 and 93050 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1201633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600821 + 600822.

It is an arithmetic number, because the mean of its divisors is an integer number (600822).

2^1201643 is an apocalyptic number.

1201643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201643 is an equidigital number, since it uses as much as digits as its factorization.

1201643 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 17.

The square root of 1201643 is about 1096.1947819617. The cubic root of 1201643 is about 106.3143333572.

Adding to 1201643 its reverse (3461021), we get a palindrome (4662664).

The spelling of 1201643 in words is "one million, two hundred one thousand, six hundred forty-three".