2651813138 has 18 divisors (see below), whose sum is σ = 4308773247. Its totient is φ = 1223476800.

The previous prime is 2651813137. The next prime is 2651813159. The reversal of 2651813138 is 8313181562.

2651813138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 411968209 + 2239844929 = 20297^2 + 47327^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=36413.

It is a super-2 number, since 2×2651813138² = 14064225837738814088, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2651813137) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 945338 + ... + 948138.

Almost surely, 2^2651813138 is an apocalyptic number.

2651813138 is a deficient number, since it is larger than the sum of its proper divisors (1656960109).

2651813138 is an frugal number, since it uses more digits than its factorization.

2651813138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5630 (or 2816 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 2651813138 is about 51495.7584466915. The cubic root of 2651813138 is about 1384.1430380107.

The spelling of 2651813138 in words is "two billion, six hundred fifty-one million, eight hundred thirteen thousand, one hundred thirty-eight".