97431997 has 8 divisors (see below), whose sum is σ = 105473144. Its totient is φ = 89468928.

The previous prime is 97431991. The next prime is 97432001. The reversal of 97431997 is 79913479.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 881721 + 96550276 = 939^2 + 9826^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97431997 - 2¹¹ = 97429949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97431997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97431991) 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 7 ways as a sum of consecutive naturals, for example, 16908 + ... + 21925.

It is an arithmetic number, because the mean of its divisors is an integer number (13184143).

Almost surely, 2^97431997 is an apocalyptic number.

It is an amenable number.

97431997 is a deficient number, since it is larger than the sum of its proper divisors (8041147).

97431997 is a wasteful number, since it uses less digits than its factorization.

97431997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39039.

The product of its digits is 428652, while the sum is 49.

The square root of 97431997 is about 9870.7647626716. The cubic root of 97431997 is about 460.1511743202.

The spelling of 97431997 in words is "ninety-seven million, four hundred thirty-one thousand, nine hundred ninety-seven".