19534935397 has 2 divisors, whose sum is σ = 19534935398. Its totient is φ = 19534935396.

The previous prime is 19534935347. The next prime is 19534935421. The reversal of 19534935397 is 79353943591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19287376641 + 247558756 = 138879^2 + 15734^2 .

It is a cyclic number.

It is not a de Polignac number, because 19534935397 - 2²³ = 19526546789 is a prime.

It is a super-2 number, since 2×19534935397² (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 (19534935337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9767467698 + 9767467699.

It is an arithmetic number, because the mean of its divisors is an integer number (9767467699).

Almost surely, 2^19534935397 is an apocalyptic number.

It is an amenable number.

19534935397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19534935397 is an equidigital number, since it uses as much as digits as its factorization.

19534935397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13778100, while the sum is 58.

The spelling of 19534935397 in words is "nineteen billion, five hundred thirty-four million, nine hundred thirty-five thousand, three hundred ninety-seven".