1241640161 has 4 divisors (see below), whose sum is σ = 1241744532. Its totient is φ = 1241535792.

The previous prime is 1241640151. The next prime is 1241640173. The reversal of 1241640161 is 1610461421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 678289936 + 563350225 = 26044^2 + 23735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1241640161 - 2¹⁰ = 1241639137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1241640161.

It is not an unprimeable number, because it can be changed into a prime (1241640121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31646 + ... + 59031.

It is an arithmetic number, because the mean of its divisors is an integer number (310436133).

Almost surely, 2^1241640161 is an apocalyptic number.

It is an amenable number.

1241640161 is a deficient number, since it is larger than the sum of its proper divisors (104371).

1241640161 is an equidigital number, since it uses as much as digits as its factorization.

1241640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104370.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1241640161 is about 35236.9147485985. The cubic root of 1241640161 is about 1074.8105412646.

The spelling of 1241640161 in words is "one billion, two hundred forty-one million, six hundred forty thousand, one hundred sixty-one".