31169781142 has 16 divisors (see below), whose sum is σ = 47421765792. Its totient is φ = 15362605440.

The previous prime is 31169781109. The next prime is 31169781157. The reversal of 31169781142 is 24118796113.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925918 + ... + 958990.

It is an arithmetic number, because the mean of its divisors is an integer number (2963860362).

Almost surely, 2^31169781142 is an apocalyptic number.

31169781142 is a deficient number, since it is larger than the sum of its proper divisors (16251984650).

31169781142 is a wasteful number, since it uses less digits than its factorization.

31169781142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39783.

The product of its digits is 72576, while the sum is 43.

The spelling of 31169781142 in words is "thirty-one billion, one hundred sixty-nine million, seven hundred eighty-one thousand, one hundred forty-two".