97720159 has 4 divisors (see below), whose sum is σ = 97992720. Its totient is φ = 97447600.

The previous prime is 97720157. The next prime is 97720163. The reversal of 97720159 is 95102779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95102779 = 8929 ⋅10651.

It is a cyclic number.

It is not a de Polignac number, because 97720159 - 2¹ = 97720157 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 (97720157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135742 + ... + 136459.

It is an arithmetic number, because the mean of its divisors is an integer number (24498180).

Almost surely, 2^97720159 is an apocalyptic number.

97720159 is a deficient number, since it is larger than the sum of its proper divisors (272561).

97720159 is a wasteful number, since it uses less digits than its factorization.

97720159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272560.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 97720159 is about 9885.3507272125. The cubic root of 97720159 is about 460.6043710058.

It can be divided in two parts, 97720 and 159, that added together give a palindrome (97879).

The spelling of 97720159 in words is "ninety-seven million, seven hundred twenty thousand, one hundred fifty-nine".