31555431102 has 16 divisors (see below), whose sum is σ = 67965544080. Its totient is φ = 9709363392.

The previous prime is 31555431053. The next prime is 31555431109. The reversal of 31555431102 is 20113455513.

It is a self number, because there is not a number n which added to its sum of digits gives 31555431102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31555431109) 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, 202278327 + ... + 202278482.

It is an arithmetic number, because the mean of its divisors is an integer number (4247846505).

Almost surely, 2^31555431102 is an apocalyptic number.

31555431102 is an abundant number, since it is smaller than the sum of its proper divisors (36410112978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31555431102 is a wasteful number, since it uses less digits than its factorization.

31555431102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404556827.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 31555431102 its reverse (20113455513), we get a palindrome (51668886615).

The spelling of 31555431102 in words is "thirty-one billion, five hundred fifty-five million, four hundred thirty-one thousand, one hundred two".