191013398 has 4 divisors (see below), whose sum is σ = 286520100. Its totient is φ = 95506698.

The previous prime is 191013391. The next prime is 191013409. The reversal of 191013398 is 893310191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 893310191 = 2297 ⋅388903.

It is a super-2 number, since 2×191013398² = 72972236431012808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191013391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47753348 + ... + 47753351.

It is an arithmetic number, because the mean of its divisors is an integer number (71630025).

Almost surely, 2^191013398 is an apocalyptic number.

191013398 is a deficient number, since it is larger than the sum of its proper divisors (95506702).

191013398 is an equidigital number, since it uses as much as digits as its factorization.

191013398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95506701.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 191013398 is about 13820.7596752132. The cubic root of 191013398 is about 575.9099874614.

The spelling of 191013398 in words is "one hundred ninety-one million, thirteen thousand, three hundred ninety-eight".