19157354191 has 4 divisors (see below), whose sum is σ = 19162299352. Its totient is φ = 19152409032.

The previous prime is 19157354159. The next prime is 19157354201. The reversal of 19157354191 is 19145375191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19145375191 = 23 ⋅832407617.

It is a cyclic number.

It is not a de Polignac number, because 19157354191 - 2⁵ = 19157354159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19157354101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466765 + ... + 2474518.

It is an arithmetic number, because the mean of its divisors is an integer number (4790574838).

Almost surely, 2^19157354191 is an apocalyptic number.

19157354191 is a deficient number, since it is larger than the sum of its proper divisors (4945161).

19157354191 is an equidigital number, since it uses as much as digits as its factorization.

19157354191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945160.

The product of its digits is 170100, while the sum is 46.

The spelling of 19157354191 in words is "nineteen billion, one hundred fifty-seven million, three hundred fifty-four thousand, one hundred ninety-one".