31820481771 has 32 divisors (see below), whose sum is σ = 46282199040. Its totient is φ = 19330022400.

The previous prime is 31820481733. The next prime is 31820481877. The reversal of 31820481771 is 17718402813.

It is a de Polignac number, because none of the positive numbers 2^k-31820481771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31820486771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 959515 + ... + 992123.

It is an arithmetic number, because the mean of its divisors is an integer number (1446318720).

Almost surely, 2^31820481771 is an apocalyptic number.

31820481771 is a deficient number, since it is larger than the sum of its proper divisors (14461717269).

31820481771 is a wasteful number, since it uses less digits than its factorization.

31820481771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32947.

The product of its (nonzero) digits is 75264, while the sum is 42.

It can be divided in two parts, 31820 and 481771, that added together give a triangular number (513591 = T₁₀₁₃).

The spelling of 31820481771 in words is "thirty-one billion, eight hundred twenty million, four hundred eighty-one thousand, seven hundred seventy-one".