19440099361 has 2 divisors, whose sum is σ = 19440099362. Its totient is φ = 19440099360.

The previous prime is 19440099347. The next prime is 19440099383. The reversal of 19440099361 is 16399004491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18797781025 + 642318336 = 137105^2 + 25344^2 .

It is a cyclic number.

It is not a de Polignac number, because 19440099361 - 2¹⁹ = 19439575073 is a prime.

It is not a weakly prime, because it can be changed into another prime (19440099311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720049680 + 9720049681.

It is an arithmetic number, because the mean of its divisors is an integer number (9720049681).

Almost surely, 2^19440099361 is an apocalyptic number.

It is an amenable number.

19440099361 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440099361 is an equidigital number, since it uses as much as digits as its factorization.

19440099361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 46.

It can be divided in two parts, 194400 and 99361, that added together give a triangular number (293761 = T₇₆₆).

The spelling of 19440099361 in words is "nineteen billion, four hundred forty million, ninety-nine thousand, three hundred sixty-one".