31545144142 has 4 divisors (see below), whose sum is σ = 47317716216. Its totient is φ = 15772572070.

The previous prime is 31545144097. The next prime is 31545144143. The reversal of 31545144142 is 24144154513.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×31545144142² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31545144098 and 31545144107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31545144143) 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 as a sum of consecutive naturals, namely, 7886286034 + ... + 7886286037.

It is an arithmetic number, because the mean of its divisors is an integer number (11829429054).

Almost surely, 2^31545144142 is an apocalyptic number.

31545144142 is a deficient number, since it is larger than the sum of its proper divisors (15772572074).

31545144142 is a wasteful number, since it uses less digits than its factorization.

31545144142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15772572073.

The product of its digits is 38400, while the sum is 34.

Adding to 31545144142 its reverse (24144154513), we get a palindrome (55689298655).

The spelling of 31545144142 in words is "thirty-one billion, five hundred forty-five million, one hundred forty-four thousand, one hundred forty-two".