841561997 has 4 divisors (see below), whose sum is σ = 849894396. Its totient is φ = 833229600.

The previous prime is 841561993. The next prime is 841562021. The reversal of 841561997 is 799165148.

841561997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 791915881 + 49646116 = 28141^2 + 7046^2 .

It is a cyclic number.

It is not a de Polignac number, because 841561997 - 2² = 841561993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (841561993) 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, 4166048 + ... + 4166249.

It is an arithmetic number, because the mean of its divisors is an integer number (212473599).

Almost surely, 2^841561997 is an apocalyptic number.

It is an amenable number.

841561997 is a deficient number, since it is larger than the sum of its proper divisors (8332399).

841561997 is a wasteful number, since it uses less digits than its factorization.

841561997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332398.

The product of its digits is 544320, while the sum is 50.

The square root of 841561997 is about 29009.6879852231. The cubic root of 841561997 is about 944.1232770903.

The spelling of 841561997 in words is "eight hundred forty-one million, five hundred sixty-one thousand, nine hundred ninety-seven".