31142104520 has 64 divisors (see below), whose sum is σ = 71360352000. Its totient is φ = 12228011008.

The previous prime is 31142104519. The next prime is 31142104523. The reversal of 31142104520 is 2540124113.

It is not an unprimeable number, because it can be changed into a prime (31142104523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1687664 + ... + 1706016.

It is an arithmetic number, because the mean of its divisors is an integer number (1115005500).

Almost surely, 2^31142104520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31142104520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35680176000).

31142104520 is an abundant number, since it is smaller than the sum of its proper divisors (40218247480).

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

31142104520 is a wasteful number, since it uses less digits than its factorization.

31142104520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19142 (or 19138 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31142104520 its reverse (2540124113), we get a palindrome (33682228633).

The spelling of 31142104520 in words is "thirty-one billion, one hundred forty-two million, one hundred four thousand, five hundred twenty".