841388748521 has 2 divisors, whose sum is σ = 841388748522. Its totient is φ = 841388748520.

The previous prime is 841388748511. The next prime is 841388748527. The reversal of 841388748521 is 125847883148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482031661225 + 359357087296 = 694285^2 + 599464^2 .

It is a cyclic number.

It is not a de Polignac number, because 841388748521 - 2²² = 841384554217 is a prime.

It is a super-2 number, since 2×841388748521² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (841388748527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420694374260 + 420694374261.

It is an arithmetic number, because the mean of its divisors is an integer number (420694374261).

Almost surely, 2^841388748521 is an apocalyptic number.

It is an amenable number.

841388748521 is a deficient number, since it is larger than the sum of its proper divisors (1).

841388748521 is an equidigital number, since it uses as much as digits as its factorization.

841388748521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13762560, while the sum is 59.

The spelling of 841388748521 in words is "eight hundred forty-one billion, three hundred eighty-eight million, seven hundred forty-eight thousand, five hundred twenty-one".