31005420343 has 4 divisors (see below), whose sum is σ = 31590428328. Its totient is φ = 30420412360.

The previous prime is 31005420317. The next prime is 31005420367. The reversal of 31005420343 is 34302450013.

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

It is a cyclic number.

It is not a de Polignac number, because 31005420343 - 2⁵ = 31005420311 is a prime.

It is a super-2 number, since 2×31005420343² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31005420143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292503913 + ... + 292504018.

It is an arithmetic number, because the mean of its divisors is an integer number (7897607082).

Almost surely, 2^31005420343 is an apocalyptic number.

31005420343 is a deficient number, since it is larger than the sum of its proper divisors (585007985).

31005420343 is an equidigital number, since it uses as much as digits as its factorization.

31005420343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585007984.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 31005420343 its reverse (34302450013), we get a palindrome (65307870356).

The spelling of 31005420343 in words is "thirty-one billion, five million, four hundred twenty thousand, three hundred forty-three".