31005400355405 has 32 divisors (see below), whose sum is σ = 42721331143680. Its totient is φ = 21161254014720.

The previous prime is 31005400355357. The next prime is 31005400355429. The reversal of 31005400355405 is 50455300450013.

It is not a de Polignac number, because 31005400355405 - 2¹² = 31005400351309 is a prime.

It is a super-2 number, since 2×31005400355405² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4166975 + ... + 8909235.

It is an arithmetic number, because the mean of its divisors is an integer number (1335041598240).

Almost surely, 2^{31005400355405} is an apocalyptic number.

31005400355405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31005400355405 is a deficient number, since it is larger than the sum of its proper divisors (11715930788275).

31005400355405 is a wasteful number, since it uses less digits than its factorization.

31005400355405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743149.

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 31005400355405 in words is "thirty-one trillion, five billion, four hundred million, three hundred fifty-five thousand, four hundred five".