31049947 has 2 divisors, whose sum is σ = 31049948. Its totient is φ = 31049946.

The previous prime is 31049899. The next prime is 31050001. The reversal of 31049947 is 74994013.

It is a weak prime.

It is an emirp because it is prime and its reverse (74994013) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31049947 is a prime.

It is not a weakly prime, because it can be changed into another prime (31049047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15524973 + 15524974.

It is an arithmetic number, because the mean of its divisors is an integer number (15524974).

Almost surely, 2^31049947 is an apocalyptic number.

31049947 is a deficient number, since it is larger than the sum of its proper divisors (1).

31049947 is an equidigital number, since it uses as much as digits as its factorization.

31049947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 31049947 is about 5572.2479305932. The cubic root of 31049947 is about 314.3066871187.

The spelling of 31049947 in words is "thirty-one million, forty-nine thousand, nine hundred forty-seven".