191506135 has 8 divisors (see below), whose sum is σ = 231485616. Its totient is φ = 152086080.

The previous prime is 191506129. The next prime is 191506157. The reversal of 191506135 is 531605191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191506135 - 2⁵ = 191506103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191506097 and 191506106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139101 + ... + 140470.

It is an arithmetic number, because the mean of its divisors is an integer number (28935702).

Almost surely, 2^191506135 is an apocalyptic number.

191506135 is a deficient number, since it is larger than the sum of its proper divisors (39979481).

191506135 is a wasteful number, since it uses less digits than its factorization.

191506135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279713.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 191506135 is about 13838.5741678830. The cubic root of 191506135 is about 576.4047668956.

The spelling of 191506135 in words is "one hundred ninety-one million, five hundred six thousand, one hundred thirty-five".