2531806138 has 8 divisors (see below), whose sum is σ = 3814293780. Its totient is φ = 1260374880.

The previous prime is 2531806103. The next prime is 2531806157. The reversal of 2531806138 is 8316081352.

It can be written as a sum of positive squares in 2 ways, for example, as 2400314049 + 131492089 = 48993^2 + 11467^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2531806097 and 2531806106.

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 in 3 ways as a sum of consecutive naturals, for example, 2763523 + ... + 2764438.

Almost surely, 2^2531806138 is an apocalyptic number.

2531806138 is a deficient number, since it is larger than the sum of its proper divisors (1282487642).

2531806138 is a wasteful number, since it uses less digits than its factorization.

2531806138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5528192.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 2531806138 is about 50317.0561340784. The cubic root of 2531806138 is about 1362.9402466795.

The spelling of 2531806138 in words is "two billion, five hundred thirty-one million, eight hundred six thousand, one hundred thirty-eight".