19131625729 has 2 divisors, whose sum is σ = 19131625730. Its totient is φ = 19131625728.

The previous prime is 19131625687. The next prime is 19131625753. The reversal of 19131625729 is 92752613191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18427519504 + 704106225 = 135748^2 + 26535^2 .

It is a cyclic number.

It is not a de Polignac number, because 19131625729 - 2¹⁹ = 19131101441 is a prime.

It is not a weakly prime, because it can be changed into another prime (19131628729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9565812864 + 9565812865.

It is an arithmetic number, because the mean of its divisors is an integer number (9565812865).

Almost surely, 2^19131625729 is an apocalyptic number.

It is an amenable number.

19131625729 is a deficient number, since it is larger than the sum of its proper divisors (1).

19131625729 is an equidigital number, since it uses as much as digits as its factorization.

19131625729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The spelling of 19131625729 in words is "nineteen billion, one hundred thirty-one million, six hundred twenty-five thousand, seven hundred twenty-nine".