31131342102 has 32 divisors (see below), whose sum is σ = 73452754944. Its totient is φ = 8607744000.

The previous prime is 31131342079. The next prime is 31131342103. The reversal of 31131342102 is 20124313113.

It is a super-2 number, since 2×31131342102² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131342103) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11953899 + ... + 11956502.

It is an arithmetic number, because the mean of its divisors is an integer number (2295398592).

Almost surely, 2^31131342102 is an apocalyptic number.

31131342102 is an abundant number, since it is smaller than the sum of its proper divisors (42321412842).

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

31131342102 is a wasteful number, since it uses less digits than its factorization.

31131342102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23910444.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31131342102 its reverse (20124313113), we get a palindrome (51255655215).

The spelling of 31131342102 in words is "thirty-one billion, one hundred thirty-one million, three hundred forty-two thousand, one hundred two".