19121478641 has 2 divisors, whose sum is σ = 19121478642. Its totient is φ = 19121478640.

The previous prime is 19121478631. The next prime is 19121478709. The reversal of 19121478641 is 14687412191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17123031025 + 1998447616 = 130855^2 + 44704^2 .

It is a cyclic number.

It is not a de Polignac number, because 19121478641 - 2¹⁴ = 19121462257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19121478592 and 19121478601.

It is not a weakly prime, because it can be changed into another prime (19121478611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560739320 + 9560739321.

It is an arithmetic number, because the mean of its divisors is an integer number (9560739321).

Almost surely, 2^19121478641 is an apocalyptic number.

It is an amenable number.

19121478641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19121478641 is an equidigital number, since it uses as much as digits as its factorization.

19121478641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The spelling of 19121478641 in words is "nineteen billion, one hundred twenty-one million, four hundred seventy-eight thousand, six hundred forty-one".