158720197 has 4 divisors (see below), whose sum is σ = 160503660. Its totient is φ = 156936736.

The previous prime is 158720189. The next prime is 158720201. The reversal of 158720197 is 791027851.

158720197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64416676 + 94303521 = 8026^2 + 9711^2 .

It is a cyclic number.

It is not a de Polignac number, because 158720197 - 2³ = 158720189 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 (158720147) 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, 891598 + ... + 891775.

It is an arithmetic number, because the mean of its divisors is an integer number (40125915).

Almost surely, 2^158720197 is an apocalyptic number.

It is an amenable number.

158720197 is a deficient number, since it is larger than the sum of its proper divisors (1783463).

158720197 is an equidigital number, since it uses as much as digits as its factorization.

158720197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783462.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 158720197 is about 12598.4204168618. The cubic root of 158720197 is about 541.4321801732.

The spelling of 158720197 in words is "one hundred fifty-eight million, seven hundred twenty thousand, one hundred ninety-seven".