781121000201 has 2 divisors, whose sum is σ = 781121000202. Its totient is φ = 781121000200.

The previous prime is 781121000137. The next prime is 781121000213. The reversal of 781121000201 is 102000121187.

781121000201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677452455625 + 103668544576 = 823075^2 + 321976^2 .

It is an emirp because it is prime and its reverse (102000121187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781121000201 - 2⁶ = 781121000137 is a prime.

It is a super-2 number, since 2×781121000201² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781121000801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390560500100 + 390560500101.

It is an arithmetic number, because the mean of its divisors is an integer number (390560500101).

Almost surely, 2^781121000201 is an apocalyptic number.

It is an amenable number.

781121000201 is a deficient number, since it is larger than the sum of its proper divisors (1).

781121000201 is an equidigital number, since it uses as much as digits as its factorization.

781121000201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 781121000201 its reverse (102000121187), we get a palindrome (883121121388).

The spelling of 781121000201 in words is "seven hundred eighty-one billion, one hundred twenty-one million, two hundred one", and thus it is an aban number.