31820378089 has 8 divisors (see below), whose sum is σ = 31935120840. Its totient is φ = 31705677696.

The previous prime is 31820378063. The next prime is 31820378101. The reversal of 31820378089 is 98087302813.

It can be written as a sum of positive squares in 4 ways, for example, as 4034155225 + 27786222864 = 63515^2 + 166692^2 .

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 31820378089 - 2⁹ = 31820377577 is a prime.

It is a super-2 number, since 2×31820378089² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31820378059) 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, 2856759 + ... + 2867875.

It is an arithmetic number, because the mean of its divisors is an integer number (3991890105).

Almost surely, 2^31820378089 is an apocalyptic number.

It is an amenable number.

31820378089 is a deficient number, since it is larger than the sum of its proper divisors (114742751).

31820378089 is a wasteful number, since it uses less digits than its factorization.

31820378089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21179.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 31820378089 in words is "thirty-one billion, eight hundred twenty million, three hundred seventy-eight thousand, eighty-nine".