1907721522349 has 2 divisors, whose sum is σ = 1907721522350. Its totient is φ = 1907721522348.

The previous prime is 1907721522209. The next prime is 1907721522367. The reversal of 1907721522349 is 9432251277091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1092505752900 + 815215769449 = 1045230^2 + 902893^2 .

It is a cyclic number.

It is not a de Polignac number, because 1907721522349 - 2¹⁵ = 1907721489581 is a prime.

It is a super-2 number, since 2×1907721522349² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1907721522296 and 1907721522305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1907721562349) 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, 953860761174 + 953860761175.

It is an arithmetic number, because the mean of its divisors is an integer number (953860761175).

Almost surely, 2^{1907721522349} is an apocalyptic number.

It is an amenable number.

1907721522349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1907721522349 is an equidigital number, since it uses as much as digits as its factorization.

1907721522349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 1907721522349 in words is "one trillion, nine hundred seven billion, seven hundred twenty-one million, five hundred twenty-two thousand, three hundred forty-nine".