47172731 has 8 divisors (see below), whose sum is σ = 48829824. Its totient is φ = 45524160.

The previous prime is 47172709. The next prime is 47172737. The reversal of 47172731 is 13727174.

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

It is a cyclic number.

It is not a de Polignac number, because 47172731 - 2¹⁸ = 46910587 is a prime.

It is a super-2 number, since 2×47172731² = 4450533099996722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47172737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10391 + ... + 14223.

It is an arithmetic number, because the mean of its divisors is an integer number (6103728).

Almost surely, 2^47172731 is an apocalyptic number.

47172731 is a deficient number, since it is larger than the sum of its proper divisors (1657093).

47172731 is a wasteful number, since it uses less digits than its factorization.

47172731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261.

The product of its digits is 8232, while the sum is 32.

The square root of 47172731 is about 6868.2407500029. The cubic root of 47172731 is about 361.3241640814.

The spelling of 47172731 in words is "forty-seven million, one hundred seventy-two thousand, seven hundred thirty-one".