31109047 has 2 divisors, whose sum is σ = 31109048. Its totient is φ = 31109046.

The previous prime is 31109017. The next prime is 31109063. The reversal of 31109047 is 74090113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31109047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31109017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554523 + 15554524.

It is an arithmetic number, because the mean of its divisors is an integer number (15554524).

Almost surely, 2^31109047 is an apocalyptic number.

31109047 is a deficient number, since it is larger than the sum of its proper divisors (1).

31109047 is an equidigital number, since it uses as much as digits as its factorization.

31109047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 31109047 is about 5577.5484758091. The cubic root of 31109047 is about 314.5059762640.

The spelling of 31109047 in words is "thirty-one million, one hundred nine thousand, forty-seven".