31551134340 has 96 divisors (see below), whose sum is σ = 96874114176. Its totient is φ = 7609098240.

The previous prime is 31551134339. The next prime is 31551134359. The reversal of 31551134340 is 4343115513.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31551134298 and 31551134307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3534 + ... + 251226.

It is an arithmetic number, because the mean of its divisors is an integer number (1009105356).

Almost surely, 2^31551134340 is an apocalyptic number.

31551134340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31551134340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48437057088).

31551134340 is an abundant number, since it is smaller than the sum of its proper divisors (65322979836).

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

31551134340 is a wasteful number, since it uses less digits than its factorization.

31551134340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247909 (or 247907 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 31551134340 its reverse (4343115513), we get a palindrome (35894249853).

The spelling of 31551134340 in words is "thirty-one billion, five hundred fifty-one million, one hundred thirty-four thousand, three hundred forty".