31348789 has 2 divisors, whose sum is σ = 31348790. Its totient is φ = 31348788.

The previous prime is 31348777. The next prime is 31348813. The reversal of 31348789 is 98784313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 2640625 = 5358^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 31348789 - 2⁹ = 31348277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31348769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15674394 + 15674395.

It is an arithmetic number, because the mean of its divisors is an integer number (15674395).

Almost surely, 2^31348789 is an apocalyptic number.

It is an amenable number.

31348789 is a deficient number, since it is larger than the sum of its proper divisors (1).

31348789 is an equidigital number, since it uses as much as digits as its factorization.

31348789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 31348789 is about 5598.9989283800. The cubic root of 31348789 is about 315.3118235781.

The spelling of 31348789 in words is "thirty-one million, three hundred forty-eight thousand, seven hundred eighty-nine".