97919309 has 4 divisors (see below), whose sum is σ = 98069916. Its totient is φ = 97768704.

The previous prime is 97919287. The next prime is 97919323. The reversal of 97919309 is 90391979.

It is a happy number.

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 15382084 + 82537225 = 3922^2 + 9085^2 .

It is a cyclic number.

It is not a de Polignac number, because 97919309 - 2¹⁶ = 97853773 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 (97919209) 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, 74324 + ... + 75629.

It is an arithmetic number, because the mean of its divisors is an integer number (24517479).

Almost surely, 2^97919309 is an apocalyptic number.

It is an amenable number.

97919309 is a deficient number, since it is larger than the sum of its proper divisors (150607).

97919309 is a wasteful number, since it uses less digits than its factorization.

97919309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150606.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 97919309 is about 9895.4185863964. The cubic root of 97919309 is about 460.9170568024.

The spelling of 97919309 in words is "ninety-seven million, nine hundred nineteen thousand, three hundred nine".