161401893241 has 2 divisors, whose sum is σ = 161401893242. Its totient is φ = 161401893240.

The previous prime is 161401893239. The next prime is 161401893277. The reversal of 161401893241 is 142398104161.

It is a happy number.

161401893241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107450217616 + 53951675625 = 327796^2 + 232275^2 .

It is a cyclic number.

It is not a de Polignac number, because 161401893241 - 2¹ = 161401893239 is a prime.

It is a super-2 number, since 2×161401893241² (a number of 23 digits) contains 22 as substring.

Together with 161401893239, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161401893194 and 161401893203.

It is not a weakly prime, because it can be changed into another prime (161401893841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80700946620 + 80700946621.

It is an arithmetic number, because the mean of its divisors is an integer number (80700946621).

Almost surely, 2^161401893241 is an apocalyptic number.

It is an amenable number.

161401893241 is a deficient number, since it is larger than the sum of its proper divisors (1).

161401893241 is an equidigital number, since it uses as much as digits as its factorization.

161401893241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 161401893241 in words is "one hundred sixty-one billion, four hundred one million, eight hundred ninety-three thousand, two hundred forty-one".