19439259551 has 2 divisors, whose sum is σ = 19439259552. Its totient is φ = 19439259550.

The previous prime is 19439259547. The next prime is 19439259589. The reversal of 19439259551 is 15595293491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19439259551 - 2² = 19439259547 is a prime.

It is a super-2 number, since 2×19439259551² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 19439259493 and 19439259502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19439258551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9719629775 + 9719629776.

It is an arithmetic number, because the mean of its divisors is an integer number (9719629776).

Almost surely, 2^19439259551 is an apocalyptic number.

19439259551 is a deficient number, since it is larger than the sum of its proper divisors (1).

19439259551 is an equidigital number, since it uses as much as digits as its factorization.

19439259551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2187000, while the sum is 53.

The spelling of 19439259551 in words is "nineteen billion, four hundred thirty-nine million, two hundred fifty-nine thousand, five hundred fifty-one".