9815040902 has 4 divisors (see below), whose sum is σ = 14722561356. Its totient is φ = 4907520450.

The previous prime is 9815040883. The next prime is 9815040931. The reversal of 9815040902 is 2090405189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2090405189 = 2699 ⋅774511.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2453760224 + ... + 2453760227.

It is an arithmetic number, because the mean of its divisors is an integer number (3680640339).

Almost surely, 2^9815040902 is an apocalyptic number.

9815040902 is a deficient number, since it is larger than the sum of its proper divisors (4907520454).

9815040902 is a wasteful number, since it uses less digits than its factorization.

9815040902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907520453.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 9815040902 is about 99070.8882669374. Note that the first 3 decimals coincide. The cubic root of 9815040902 is about 2141.0692026574.

The spelling of 9815040902 in words is "nine billion, eight hundred fifteen million, forty thousand, nine hundred two".