31478320511 has 8 divisors (see below), whose sum is σ = 34390272384. Its totient is φ = 28574749720.

The previous prime is 31478320463. The next prime is 31478320537. The reversal of 31478320511 is 11502387413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31478320511 - 2³⁴ = 14298451327 is a prime.

It is a super-2 number, since 2×31478320511² (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 (31478320561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2087411 + ... + 2102436.

It is an arithmetic number, because the mean of its divisors is an integer number (4298784048).

Almost surely, 2^31478320511 is an apocalyptic number.

31478320511 is a deficient number, since it is larger than the sum of its proper divisors (2911951873).

31478320511 is a wasteful number, since it uses less digits than its factorization.

31478320511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190541.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 31478320511 in words is "thirty-one billion, four hundred seventy-eight million, three hundred twenty thousand, five hundred eleven".