31143402342 has 128 divisors (see below), whose sum is σ = 77145600000. Its totient is φ = 9248152320.

The previous prime is 31143402259. The next prime is 31143402359. The reversal of 31143402342 is 24320434113.

31143402342 is a `hidden beast` number, since 311 + 4 + 3 + 4 + 0 + 2 + 342 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 8898909 + ... + 8902407.

It is an arithmetic number, because the mean of its divisors is an integer number (602700000).

Almost surely, 2^31143402342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143402342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38572800000).

31143402342 is an abundant number, since it is smaller than the sum of its proper divisors (46002197658).

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

31143402342 is a wasteful number, since it uses less digits than its factorization.

31143402342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963 (or 3957 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31143402342 its reverse (24320434113), we get a palindrome (55463836455).

The spelling of 31143402342 in words is "thirty-one billion, one hundred forty-three million, four hundred two thousand, three hundred forty-two".