97391521 has 4 divisors (see below), whose sum is σ = 103120452. Its totient is φ = 91662592.

The previous prime is 97391513. The next prime is 97391531. The reversal of 97391521 is 12519379.

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 73273600 + 24117921 = 8560^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 97391521 - 2³ = 97391513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97391531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2864440 + ... + 2864473.

It is an arithmetic number, because the mean of its divisors is an integer number (25780113).

Almost surely, 2^97391521 is an apocalyptic number.

It is an amenable number.

97391521 is a deficient number, since it is larger than the sum of its proper divisors (5728931).

97391521 is a wasteful number, since it uses less digits than its factorization.

97391521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5728930.

The product of its digits is 17010, while the sum is 37.

The square root of 97391521 is about 9868.7142526268. The cubic root of 97391521 is about 460.0874455684.

The spelling of 97391521 in words is "ninety-seven million, three hundred ninety-one thousand, five hundred twenty-one".