158684991 has 16 divisors (see below), whose sum is σ = 215297376. Its totient is φ = 103942656.

The previous prime is 158684989. The next prime is 158685061. The reversal of 158684991 is 199486851.

It is not a de Polignac number, because 158684991 - 2¹ = 158684989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158684191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62931 + ... + 65403.

It is an arithmetic number, because the mean of its divisors is an integer number (13456086).

Almost surely, 2^158684991 is an apocalyptic number.

158684991 is a deficient number, since it is larger than the sum of its proper divisors (56612385).

158684991 is a wasteful number, since it uses less digits than its factorization.

158684991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842.

The product of its digits is 622080, while the sum is 51.

The square root of 158684991 is about 12597.0231007171. The cubic root of 158684991 is about 541.3921452118.

The spelling of 158684991 in words is "one hundred fifty-eight million, six hundred eighty-four thousand, nine hundred ninety-one".