191568136 has 8 divisors (see below), whose sum is σ = 359190270. Its totient is φ = 95784064.

The previous prime is 191568131. The next prime is 191568137. The reversal of 191568136 is 631865191.

It can be written as a sum of positive squares in only one way, i.e., 110460100 + 81108036 = 10510^2 + 9006^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (191568131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11973001 + ... + 11973016.

Almost surely, 2^191568136 is an apocalyptic number.

It is an amenable number.

191568136 is a deficient number, since it is larger than the sum of its proper divisors (167622134).

191568136 is a wasteful number, since it uses less digits than its factorization.

191568136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23946023 (or 23946019 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 191568136 is about 13840.8141379039. The cubic root of 191568136 is about 576.4669647566.

The spelling of 191568136 in words is "one hundred ninety-one million, five hundred sixty-eight thousand, one hundred thirty-six".