1213642041 has 4 divisors (see below), whose sum is σ = 1618189392. Its totient is φ = 809094692.

The previous prime is 1213642013. The next prime is 1213642049. The reversal of 1213642041 is 1402463121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1402463121 = 3 ⋅467487707.

It is a cyclic number.

It is not a de Polignac number, because 1213642041 - 2¹⁹ = 1213117753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213642049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202273671 + ... + 202273676.

It is an arithmetic number, because the mean of its divisors is an integer number (404547348).

Almost surely, 2^1213642041 is an apocalyptic number.

It is an amenable number.

1213642041 is a deficient number, since it is larger than the sum of its proper divisors (404547351).

1213642041 is an equidigital number, since it uses as much as digits as its factorization.

1213642041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404547350.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1213642041 is about 34837.3655863930. The cubic root of 1213642041 is about 1066.6703027979.

The spelling of 1213642041 in words is "one billion, two hundred thirteen million, six hundred forty-two thousand, forty-one".