31433220142 has 4 divisors (see below), whose sum is σ = 47149830216. Its totient is φ = 15716610070.

The previous prime is 31433220139. The next prime is 31433220173. The reversal of 31433220142 is 24102233413.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7858305034 + ... + 7858305037.

It is an arithmetic number, because the mean of its divisors is an integer number (11787457554).

Almost surely, 2^31433220142 is an apocalyptic number.

31433220142 is a deficient number, since it is larger than the sum of its proper divisors (15716610074).

31433220142 is a wasteful number, since it uses less digits than its factorization.

31433220142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15716610073.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31433220142 its reverse (24102233413), we get a palindrome (55535453555).

The spelling of 31433220142 in words is "thirty-one billion, four hundred thirty-three million, two hundred twenty thousand, one hundred forty-two".