31142393566 has 4 divisors (see below), whose sum is σ = 46713590352. Its totient is φ = 15571196782.

The previous prime is 31142393521. The next prime is 31142393591. The reversal of 31142393566 is 66539324113.

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 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, 7785598390 + ... + 7785598393.

It is an arithmetic number, because the mean of its divisors is an integer number (11678397588).

Almost surely, 2^31142393566 is an apocalyptic number.

31142393566 is a deficient number, since it is larger than the sum of its proper divisors (15571196786).

31142393566 is a wasteful number, since it uses less digits than its factorization.

31142393566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15571196785.

The product of its digits is 349920, while the sum is 43.

The spelling of 31142393566 in words is "thirty-one billion, one hundred forty-two million, three hundred ninety-three thousand, five hundred sixty-six".