19847711461 has 2 divisors, whose sum is σ = 19847711462. Its totient is φ = 19847711460.

The previous prime is 19847711453. The next prime is 19847711479. The reversal of 19847711461 is 16411774891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14615359236 + 5232352225 = 120894^2 + 72335^2 .

It is a cyclic number.

It is not a de Polignac number, because 19847711461 - 2³ = 19847711453 is a prime.

It is a super-2 number, since 2×19847711461² (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 (19847711431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9923855730 + 9923855731.

It is an arithmetic number, because the mean of its divisors is an integer number (9923855731).

Almost surely, 2^19847711461 is an apocalyptic number.

It is an amenable number.

19847711461 is a deficient number, since it is larger than the sum of its proper divisors (1).

19847711461 is an equidigital number, since it uses as much as digits as its factorization.

19847711461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 49.

The spelling of 19847711461 in words is "nineteen billion, eight hundred forty-seven million, seven hundred eleven thousand, four hundred sixty-one".