31506400042 has 8 divisors (see below), whose sum is σ = 50894953956. Its totient is φ = 14541415392.

The previous prime is 31506400027. The next prime is 31506400043. The reversal of 31506400042 is 24000460513.

It can be written as a sum of positive squares in 2 ways, for example, as 25383181041 + 6123219001 = 159321^2 + 78251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31506400043) 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 in 3 ways as a sum of consecutive naturals, for example, 605892283 + ... + 605892334.

Almost surely, 2^31506400042 is an apocalyptic number.

31506400042 is a deficient number, since it is larger than the sum of its proper divisors (19388553914).

31506400042 is a wasteful number, since it uses less digits than its factorization.

31506400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211784632.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31506400042 its reverse (24000460513), we get a palindrome (55506860555).

The spelling of 31506400042 in words is "thirty-one billion, five hundred six million, four hundred thousand, forty-two".