158200991 has 4 divisors (see below), whose sum is σ = 170370312. Its totient is φ = 146031672.

The previous prime is 158200981. The next prime is 158201009. The reversal of 158200991 is 199002851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199002851 = 4663 ⋅42677.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158200991 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 (158200901) 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, 6084641 + ... + 6084666.

It is an arithmetic number, because the mean of its divisors is an integer number (42592578).

Almost surely, 2^158200991 is an apocalyptic number.

158200991 is a deficient number, since it is larger than the sum of its proper divisors (12169321).

158200991 is a wasteful number, since it uses less digits than its factorization.

158200991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12169320.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 158200991 is about 12577.7975417002. The cubic root of 158200991 is about 540.8411570435.

The spelling of 158200991 in words is "one hundred fifty-eight million, two hundred thousand, nine hundred ninety-one".