31661152142 has 4 divisors (see below), whose sum is σ = 47491728216. Its totient is φ = 15830576070.

The previous prime is 31661152099. The next prime is 31661152157. The reversal of 31661152142 is 24125116613.

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

It is a junction number, because it is equal to n+sod(n) for n = 31661152099 and 31661152108.

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, 7915288034 + ... + 7915288037.

It is an arithmetic number, because the mean of its divisors is an integer number (11872932054).

Almost surely, 2^31661152142 is an apocalyptic number.

31661152142 is a deficient number, since it is larger than the sum of its proper divisors (15830576074).

31661152142 is a wasteful number, since it uses less digits than its factorization.

31661152142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830576073.

The product of its digits is 8640, while the sum is 32.

Adding to 31661152142 its reverse (24125116613), we get a palindrome (55786268755).

The spelling of 31661152142 in words is "thirty-one billion, six hundred sixty-one million, one hundred fifty-two thousand, one hundred forty-two".