158691471 has 4 divisors (see below), whose sum is σ = 211588632. Its totient is φ = 105794312.

The previous prime is 158691433. The next prime is 158691473. The reversal of 158691471 is 174196851.

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

It is a cyclic number.

It is not a de Polignac number, because 158691471 - 2¹⁷ = 158560399 is a prime.

It is a super-3 number, since 3×158691471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158691473) 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, 26448576 + ... + 26448581.

It is an arithmetic number, because the mean of its divisors is an integer number (52897158).

Almost surely, 2^158691471 is an apocalyptic number.

158691471 is a deficient number, since it is larger than the sum of its proper divisors (52897161).

158691471 is an equidigital number, since it uses as much as digits as its factorization.

158691471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52897160.

The product of its digits is 60480, while the sum is 42.

The square root of 158691471 is about 12597.2803017159. The cubic root of 158691471 is about 541.3995144728.

The spelling of 158691471 in words is "one hundred fifty-eight million, six hundred ninety-one thousand, four hundred seventy-one".