19081049261 has 2 divisors, whose sum is σ = 19081049262. Its totient is φ = 19081049260.

The previous prime is 19081049257. The next prime is 19081049287. The reversal of 19081049261 is 16294018091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16901560036 + 2179489225 = 130006^2 + 46685^2 .

It is a cyclic number.

It is not a de Polignac number, because 19081049261 - 2² = 19081049257 is a prime.

It is a super-2 number, since 2×19081049261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19081049201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540524630 + 9540524631.

It is an arithmetic number, because the mean of its divisors is an integer number (9540524631).

Almost surely, 2^19081049261 is an apocalyptic number.

It is an amenable number.

19081049261 is a deficient number, since it is larger than the sum of its proper divisors (1).

19081049261 is an equidigital number, since it uses as much as digits as its factorization.

19081049261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 19081049261 in words is "nineteen billion, eighty-one million, forty-nine thousand, two hundred sixty-one".