31470447 has 4 divisors (see below), whose sum is σ = 41960600. Its totient is φ = 20980296.

The previous prime is 31470443. The next prime is 31470469. The reversal of 31470447 is 74407413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74407413 = 3 ⋅24802471.

It is not a de Polignac number, because 31470447 - 2² = 31470443 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 (31470443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5245072 + ... + 5245077.

It is an arithmetic number, because the mean of its divisors is an integer number (10490150).

Almost surely, 2^31470447 is an apocalyptic number.

31470447 is a deficient number, since it is larger than the sum of its proper divisors (10490153).

31470447 is a wasteful number, since it uses less digits than its factorization.

31470447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10490152.

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 31470447 is about 5609.8526718622. The cubic root of 31470447 is about 315.7191831727.

The spelling of 31470447 in words is "thirty-one million, four hundred seventy thousand, four hundred forty-seven".