9878397031 has 4 divisors (see below), whose sum is σ = 9892330600. Its totient is φ = 9864463464.

The previous prime is 9878397017. The next prime is 9878397037. The reversal of 9878397031 is 1307938789.

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 9878397031 - 2¹⁵ = 9878364263 is a prime.

It is a super-2 number, since 2×9878397031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878397037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6965721 + ... + 6967138.

It is an arithmetic number, because the mean of its divisors is an integer number (2473082650).

Almost surely, 2^9878397031 is an apocalyptic number.

9878397031 is a deficient number, since it is larger than the sum of its proper divisors (13933569).

9878397031 is a wasteful number, since it uses less digits than its factorization.

9878397031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13933568.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The square root of 9878397031 is about 99390.1254199832. The cubic root of 9878397031 is about 2145.6661957385. Note that the first 3 decimals are identical.

The spelling of 9878397031 in words is "nine billion, eight hundred seventy-eight million, three hundred ninety-seven thousand, thirty-one".