31431113541405 has 24 divisors (see below), whose sum is σ = 55042252449912. Its totient is φ = 16590443433984.

The previous prime is 31431113541403. The next prime is 31431113541407. The reversal of 31431113541405 is 50414531113413.

It is a happy number.

31431113541405 is a `hidden beast` number, since 31 + 4 + 31 + 1 + 13 + 541 + 40 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (31431113541403) and next prime (31431113541407).

It can be written as a sum of positive squares in 4 ways, for example, as 1437286879161 + 29993826662244 = 1198869^2 + 5476662^2 .

It is not a de Polignac number, because 31431113541405 - 2¹ = 31431113541403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31431113541405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431113541403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3600352284 + ... + 3600361013.

It is an arithmetic number, because the mean of its divisors is an integer number (2293427185413).

Almost surely, 2^{31431113541405} is an apocalyptic number.

It is an amenable number.

31431113541405 is a deficient number, since it is larger than the sum of its proper divisors (23611138908507).

31431113541405 is a wasteful number, since it uses less digits than its factorization.

31431113541405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200713405 (or 7200713402 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 31431113541405 its reverse (50414531113413), we get a palindrome (81845644654818).

The spelling of 31431113541405 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred thirteen million, five hundred forty-one thousand, four hundred five".