31530136051 has 4 divisors (see below), whose sum is σ = 31533309472. Its totient is φ = 31526962632.

The previous prime is 31530136021. The next prime is 31530136061. The reversal of 31530136051 is 15063103513.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31530136051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31530136021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571760 + ... + 1591693.

It is an arithmetic number, because the mean of its divisors is an integer number (7883327368).

Almost surely, 2^31530136051 is an apocalyptic number.

31530136051 is a deficient number, since it is larger than the sum of its proper divisors (3173421).

31530136051 is an equidigital number, since it uses as much as digits as its factorization.

31530136051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173420.

The product of its (nonzero) digits is 4050, while the sum is 28.

Adding to 31530136051 its reverse (15063103513), we get a palindrome (46593239564).

The spelling of 31530136051 in words is "thirty-one billion, five hundred thirty million, one hundred thirty-six thousand, fifty-one".