47447731 has 12 divisors (see below), whose sum is σ = 53061880. Its totient is φ = 42301440.

The previous prime is 47447723. The next prime is 47447747. The reversal of 47447731 is 13774474.

It is not a de Polignac number, because 47447731 - 2³ = 47447723 is a prime.

It is a super-2 number, since 2×47447731² = 4502574354096722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47447711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1171 + ... + 9811.

Almost surely, 2^47447731 is an apocalyptic number.

47447731 is the 4357-th centered pentagonal number.

47447731 is a deficient number, since it is larger than the sum of its proper divisors (5614149).

47447731 is a wasteful number, since it uses less digits than its factorization.

47447731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8694 (or 8677 counting only the distinct ones).

The product of its digits is 65856, while the sum is 37.

The square root of 47447731 is about 6888.2313404821. The cubic root of 47447731 is about 362.0249339276.

It can be divided in two parts, 474 and 47731, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 47447731 in words is "forty-seven million, four hundred forty-seven thousand, seven hundred thirty-one".