19503391231 has 2 divisors, whose sum is σ = 19503391232. Its totient is φ = 19503391230.

The previous prime is 19503391223. The next prime is 19503391249. The reversal of 19503391231 is 13219330591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19503391231 - 2³ = 19503391223 is a prime.

It is a super-2 number, since 2×19503391231² (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 (19503391031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9751695615 + 9751695616.

It is an arithmetic number, because the mean of its divisors is an integer number (9751695616).

Almost surely, 2^19503391231 is an apocalyptic number.

19503391231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19503391231 is an equidigital number, since it uses as much as digits as its factorization.

19503391231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 37.

The spelling of 19503391231 in words is "nineteen billion, five hundred three million, three hundred ninety-one thousand, two hundred thirty-one".