97878225209 has 8 divisors (see below), whose sum is σ = 99510098952. Its totient is φ = 96247232640.

The previous prime is 97878225073. The next prime is 97878225227. The reversal of 97878225209 is 90252287879.

It can be written as a sum of positive squares in 4 ways, for example, as 12162781225 + 85715443984 = 110285^2 + 292772^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97878225209 - 2²⁰ = 97877176633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97878224209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5627 + ... + 442479.

It is an arithmetic number, because the mean of its divisors is an integer number (12438762369).

Almost surely, 2^97878225209 is an apocalyptic number.

It is an amenable number.

97878225209 is a deficient number, since it is larger than the sum of its proper divisors (1631873743).

97878225209 is a wasteful number, since it uses less digits than its factorization.

97878225209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440587.

The product of its (nonzero) digits is 10160640, while the sum is 59.

The spelling of 97878225209 in words is "ninety-seven billion, eight hundred seventy-eight million, two hundred twenty-five thousand, two hundred nine".