97213509 has 12 divisors (see below), whose sum is σ = 140510656. Its totient is φ = 64766952.

The previous prime is 97213483. The next prime is 97213513. The reversal of 97213509 is 90531279.

It is not a de Polignac number, because 97213509 - 2⁷ = 97213381 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 (97213549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18222 + ... + 22944.

Almost surely, 2^97213509 is an apocalyptic number.

It is an amenable number.

97213509 is a deficient number, since it is larger than the sum of its proper divisors (43297147).

97213509 is a wasteful number, since it uses less digits than its factorization.

97213509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016 (or 7013 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 97213509 is about 9859.6911209226. The cubic root of 97213509 is about 459.8069590135.

The spelling of 97213509 in words is "ninety-seven million, two hundred thirteen thousand, five hundred nine".