97509823 has 4 divisors (see below), whose sum is σ = 98845648. Its totient is φ = 96174000.

The previous prime is 97509821. The next prime is 97509827. The reversal of 97509823 is 32890579.

It is a happy number.

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 97509823 - 2¹ = 97509821 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 97509823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97509821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667803 + ... + 667948.

It is an arithmetic number, because the mean of its divisors is an integer number (24711412).

Almost surely, 2^97509823 is an apocalyptic number.

97509823 is a deficient number, since it is larger than the sum of its proper divisors (1335825).

97509823 is a wasteful number, since it uses less digits than its factorization.

97509823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335824.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 97509823 is about 9874.7062234782. The cubic root of 97509823 is about 460.2736604147.

The spelling of 97509823 in words is "ninety-seven million, five hundred nine thousand, eight hundred twenty-three".