31380056730405 has 12 divisors (see below), whose sum is σ = 54392098332780. Its totient is φ = 16736030256192.

The previous prime is 31380056730383. The next prime is 31380056730457. The reversal of 31380056730405 is 50403765008313.

31380056730405 is a `hidden beast` number, since 3 + 1 + 3 + 80 + 0 + 567 + 3 + 0 + 4 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24075096463044 + 7304960267361 = 4906638^2 + 2702769^2 .

It is not a de Polignac number, because 31380056730405 - 2¹⁰ = 31380056729381 is a prime.

It is a super-2 number, since 2×31380056730405² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 697334594009 = 31380056730405 / (3 + 1 + 3 + 8 + 0 + 0 + 5 + 6 + 7 + 3 + 0 + 4 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348667296960 + ... + 348667297049.

It is an arithmetic number, because the mean of its divisors is an integer number (4532674861065).

Almost surely, 2^{31380056730405} is an apocalyptic number.

It is an amenable number.

31380056730405 is a deficient number, since it is larger than the sum of its proper divisors (23012041602375).

31380056730405 is a wasteful number, since it uses less digits than its factorization.

31380056730405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697334594020 (or 697334594017 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 31380056730405 in words is "thirty-one trillion, three hundred eighty billion, fifty-six million, seven hundred thirty thousand, four hundred five".