31471031047 has 4 divisors (see below), whose sum is σ = 31508994520. Its totient is φ = 31433067576.

The previous prime is 31471031021. The next prime is 31471031087. The reversal of 31471031047 is 74013017413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74013017413 = 491 ⋅150739343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31471031047 is a prime.

It is a super-2 number, since 2×31471031047² (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 (31471031087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18980493 + ... + 18982150.

It is an arithmetic number, because the mean of its divisors is an integer number (7877248630).

Almost surely, 2^31471031047 is an apocalyptic number.

31471031047 is a deficient number, since it is larger than the sum of its proper divisors (37963473).

31471031047 is an equidigital number, since it uses as much as digits as its factorization.

31471031047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37963472.

The product of its (nonzero) digits is 7056, while the sum is 31.

The spelling of 31471031047 in words is "thirty-one billion, four hundred seventy-one million, thirty-one thousand, forty-seven".