31130039 has 2 divisors, whose sum is σ = 31130040. Its totient is φ = 31130038.

The previous prime is 31129991. The next prime is 31130051. The reversal of 31130039 is 93003113.

31130039 is nontrivially palindromic in base 2.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31130039 - 2¹² = 31125943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31130039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31132039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565019 + 15565020.

It is an arithmetic number, because the mean of its divisors is an integer number (15565020).

Almost surely, 2^31130039 is an apocalyptic number.

31130039 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130039 is an equidigital number, since it uses as much as digits as its factorization.

31130039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 31130039 is about 5579.4299888071. The cubic root of 31130039 is about 314.5767019386.

The spelling of 31130039 in words is "thirty-one million, one hundred thirty thousand, thirty-nine".