97785515 has 4 divisors (see below), whose sum is σ = 117342624. Its totient is φ = 78228408.

The previous prime is 97785503. The next prime is 97785529. The reversal of 97785515 is 51558779.

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 97785515 - 2¹² = 97781419 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 97785515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9778547 + ... + 9778556.

It is an arithmetic number, because the mean of its divisors is an integer number (29335656).

Almost surely, 2^97785515 is an apocalyptic number.

97785515 is a deficient number, since it is larger than the sum of its proper divisors (19557109).

97785515 is a wasteful number, since it uses less digits than its factorization.

97785515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19557108.

The product of its digits is 441000, while the sum is 47.

The square root of 97785515 is about 9888.6558742834. The cubic root of 97785515 is about 460.7070333803.

The spelling of 97785515 in words is "ninety-seven million, seven hundred eighty-five thousand, five hundred fifteen".