840601121 has 2 divisors, whose sum is σ = 840601122. Its totient is φ = 840601120.

The previous prime is 840601093. The next prime is 840601129. The reversal of 840601121 is 121106048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 737882896 + 102718225 = 27164^2 + 10135^2 .

It is a cyclic number.

It is not a de Polignac number, because 840601121 - 2¹⁸ = 840338977 is a prime.

It is a super-2 number, since 2×840601121² = 1413220489252913282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (840601129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420300560 + 420300561.

It is an arithmetic number, because the mean of its divisors is an integer number (420300561).

Almost surely, 2^840601121 is an apocalyptic number.

It is an amenable number.

840601121 is a deficient number, since it is larger than the sum of its proper divisors (1).

840601121 is an equidigital number, since it uses as much as digits as its factorization.

840601121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 840601121 is about 28993.1219602167. The cubic root of 840601121 is about 943.7638142153.

Adding to 840601121 its reverse (121106048), we get a palindrome (961707169).

The spelling of 840601121 in words is "eight hundred forty million, six hundred one thousand, one hundred twenty-one".