19461000781 has 16 divisors (see below), whose sum is σ = 20613356800. Its totient is φ = 18321811200.

The previous prime is 19461000763. The next prime is 19461000799. The reversal of 19461000781 is 18700016491.

It is an interprime number because it is at equal distance from previous prime (19461000763) and next prime (19461000799).

It is a cyclic number.

It is not a de Polignac number, because 19461000781 - 2⁹ = 19461000269 is a prime.

It is a super-2 number, since 2×19461000781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19461000781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19461006781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2101321 + ... + 2110561.

It is an arithmetic number, because the mean of its divisors is an integer number (1288334800).

Almost surely, 2^19461000781 is an apocalyptic number.

19461000781 is the 62388-th centered decagonal number.

It is an amenable number.

19461000781 is a deficient number, since it is larger than the sum of its proper divisors (1152356019).

19461000781 is a wasteful number, since it uses less digits than its factorization.

19461000781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9940.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 19461000781 in words is "nineteen billion, four hundred sixty-one million, seven hundred eighty-one", and thus it is an aban number.