31474447 has 4 divisors (see below), whose sum is σ = 31612120. Its totient is φ = 31336776.

The previous prime is 31474433. The next prime is 31474481. The reversal of 31474447 is 74447413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74447413 = 2243 ⋅33191.

It is a cyclic number.

It is not a de Polignac number, because 31474447 - 2⁷ = 31474319 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 (31474747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68493 + ... + 68950.

It is an arithmetic number, because the mean of its divisors is an integer number (7903030).

Almost surely, 2^31474447 is an apocalyptic number.

31474447 is a deficient number, since it is larger than the sum of its proper divisors (137673).

31474447 is a wasteful number, since it uses less digits than its factorization.

31474447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137672.

The product of its digits is 37632, while the sum is 34.

The square root of 31474447 is about 5610.2091761359. The cubic root of 31474447 is about 315.7325589305.

The spelling of 31474447 in words is "thirty-one million, four hundred seventy-four thousand, four hundred forty-seven".