31421131155166 has 4 divisors (see below), whose sum is σ = 47131696732752. Its totient is φ = 15710565577582.

The previous prime is 31421131155091. The next prime is 31421131155191. The reversal of 31421131155166 is 66155113112413.

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, 7855282788790 + ... + 7855282788793.

It is an arithmetic number, because the mean of its divisors is an integer number (11782924183188).

Almost surely, 2^{31421131155166} is an apocalyptic number.

31421131155166 is a deficient number, since it is larger than the sum of its proper divisors (15710565577586).

31421131155166 is a wasteful number, since it uses less digits than its factorization.

31421131155166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15710565577585.

The product of its digits is 64800, while the sum is 40.

Adding to 31421131155166 its reverse (66155113112413), we get a palindrome (97576244267579).

The spelling of 31421131155166 in words is "thirty-one trillion, four hundred twenty-one billion, one hundred thirty-one million, one hundred fifty-five thousand, one hundred sixty-six".