31305434 has 4 divisors (see below), whose sum is σ = 46958154. Its totient is φ = 15652716.

The previous prime is 31305401. The next prime is 31305451. The reversal of 31305434 is 43450313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43450313 = 31 ⋅1401623.

It can be written as a sum of positive squares in only one way, i.e., 23493409 + 7812025 = 4847^2 + 2795^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7826357 + ... + 7826360.

Almost surely, 2^31305434 is an apocalyptic number.

31305434 is a deficient number, since it is larger than the sum of its proper divisors (15652720).

31305434 is a wasteful number, since it uses less digits than its factorization.

31305434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15652719.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 31305434 is about 5595.1259145796. The cubic root of 31305434 is about 315.1663990245.

Adding to 31305434 its reverse (43450313), we get a palindrome (74755747).

The spelling of 31305434 in words is "thirty-one million, three hundred five thousand, four hundred thirty-four".