47391731 has 2 divisors, whose sum is σ = 47391732. Its totient is φ = 47391730.

The previous prime is 47391727. The next prime is 47391749. The reversal of 47391731 is 13719374.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47391731 - 2² = 47391727 is a prime.

It is a super-2 number, since 2×47391731² = 4491952334352722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 47391691 and 47391700.

It is not a weakly prime, because it can be changed into another prime (47391791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23695865 + 23695866.

It is an arithmetic number, because the mean of its divisors is an integer number (23695866).

Almost surely, 2^47391731 is an apocalyptic number.

47391731 is a deficient number, since it is larger than the sum of its proper divisors (1).

47391731 is an equidigital number, since it uses as much as digits as its factorization.

47391731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 35.

The square root of 47391731 is about 6884.1652362505. The cubic root of 47391731 is about 361.8824516847.

The spelling of 47391731 in words is "forty-seven million, three hundred ninety-one thousand, seven hundred thirty-one".