31440542215 has 4 divisors (see below), whose sum is σ = 37728650664. Its totient is φ = 25152433768.

The previous prime is 31440542129. The next prime is 31440542219. The reversal of 31440542215 is 51224504413.

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 31440542215 - 2²⁷ = 31306324487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440542219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3144054217 + ... + 3144054226.

It is an arithmetic number, because the mean of its divisors is an integer number (9432162666).

Almost surely, 2^31440542215 is an apocalyptic number.

31440542215 is a deficient number, since it is larger than the sum of its proper divisors (6288108449).

31440542215 is an equidigital number, since it uses as much as digits as its factorization.

31440542215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288108448.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 31440542215 in words is "thirty-one billion, four hundred forty million, five hundred forty-two thousand, two hundred fifteen".