31220340145135 has 4 divisors (see below), whose sum is σ = 37464408174168. Its totient is φ = 24976272116104.

The previous prime is 31220340145103. The next prime is 31220340145153. The reversal of 31220340145135 is 53154104302213.

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 31220340145135 - 2⁵ = 31220340145103 is a prime.

It is a super-4 number, since 4×31220340145135⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220340145135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3122034014509 + ... + 3122034014518.

It is an arithmetic number, because the mean of its divisors is an integer number (9366102043542).

Almost surely, 2^{31220340145135} is an apocalyptic number.

31220340145135 is a deficient number, since it is larger than the sum of its proper divisors (6244068029033).

31220340145135 is an equidigital number, since it uses as much as digits as its factorization.

31220340145135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244068029032.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 31220340145135 its reverse (53154104302213), we get a palindrome (84374444447348).

The spelling of 31220340145135 in words is "thirty-one trillion, two hundred twenty billion, three hundred forty million, one hundred forty-five thousand, one hundred thirty-five".