191491870034 has 4 divisors (see below), whose sum is σ = 287237805054. Its totient is φ = 95745935016.

The previous prime is 191491870013. The next prime is 191491870043. The reversal of 191491870034 is 430078194191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 143750931025 + 47740939009 = 379145^2 + 218497^2 .

It is a super-2 number, since 2×191491870034² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47872967507 + ... + 47872967510.

Almost surely, 2^191491870034 is an apocalyptic number.

191491870034 is a deficient number, since it is larger than the sum of its proper divisors (95745935020).

191491870034 is an equidigital number, since it uses as much as digits as its factorization.

191491870034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95745935019.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 191491870034 in words is "one hundred ninety-one billion, four hundred ninety-one million, eight hundred seventy thousand, thirty-four".