31242434 has 4 divisors (see below), whose sum is σ = 46863654. Its totient is φ = 15621216.

The previous prime is 31242433. The next prime is 31242457. The reversal of 31242434 is 43424213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43424213 = 7 ⋅6203459.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 14799409 = 4055^2 + 3847^2 .

It is not an unprimeable number, because it can be changed into a prime (31242433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7810607 + ... + 7810610.

Almost surely, 2^31242434 is an apocalyptic number.

31242434 is a deficient number, since it is larger than the sum of its proper divisors (15621220).

31242434 is a wasteful number, since it uses less digits than its factorization.

31242434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15621219.

The product of its digits is 2304, while the sum is 23.

The square root of 31242434 is about 5589.4931791711. The cubic root of 31242434 is about 314.9548402548.

Adding to 31242434 its reverse (43424213), we get a palindrome (74666647).

It can be divided in two parts, 31242 and 434, that multiplied together give a triangular number (13559028 = T₅₂₀₇).

The spelling of 31242434 in words is "thirty-one million, two hundred forty-two thousand, four hundred thirty-four".