31143242000 has 320 divisors, whose sum is σ = 89109296640. Its totient is φ = 10416384000.

The previous prime is 31143241973. The next prime is 31143242017. The reversal of 31143242000 is 24234113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11360630 + ... + 11363370.

It is an arithmetic number, because the mean of its divisors is an integer number (278466552).

Almost surely, 2^31143242000 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 31143242000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44554648320).

31143242000 is an abundant number, since it is smaller than the sum of its proper divisors (57966054640).

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

31143242000 is a wasteful number, since it uses less digits than its factorization.

31143242000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819 (or 2803 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31143242000 its reverse (24234113), we get a palindrome (31167476113).

The spelling of 31143242000 in words is "thirty-one billion, one hundred forty-three million, two hundred forty-two thousand".