3131505242 has 4 divisors (see below), whose sum is σ = 4697257866. Its totient is φ = 1565752620.

The previous prime is 3131505241. The next prime is 3131505263. The reversal of 3131505242 is 2425051313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1769969041 + 1361536201 = 42071^2 + 36899^2 .

It is not an unprimeable number, because it can be changed into a prime (3131505241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782876309 + ... + 782876312.

Almost surely, 2^3131505242 is an apocalyptic number.

3131505242 is a deficient number, since it is larger than the sum of its proper divisors (1565752624).

3131505242 is a wasteful number, since it uses less digits than its factorization.

3131505242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565752623.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 3131505242 is about 55959.8538418392. The cubic root of 3131505242 is about 1463.0226429414.

Adding to 3131505242 its reverse (2425051313), we get a palindrome (5556556555).

The spelling of 3131505242 in words is "three billion, one hundred thirty-one million, five hundred five thousand, two hundred forty-two".