2561118238 has 32 divisors (see below), whose sum is σ = 4809067200. Its totient is φ = 997430784.

The previous prime is 2561118223. The next prime is 2561118253. The reversal of 2561118238 is 8328111652.

It is an interprime number because it is at equal distance from previous prime (2561118223) and next prime (2561118253).

It is a junction number, because it is equal to n+sod(n) for n = 2561118197 and 2561118206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178633 + ... + 192436.

It is an arithmetic number, because the mean of its divisors is an integer number (150283350).

Almost surely, 2^2561118238 is an apocalyptic number.

2561118238 is a deficient number, since it is larger than the sum of its proper divisors (2247948962).

2561118238 is a wasteful number, since it uses less digits than its factorization.

2561118238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371124.

The product of its digits is 23040, while the sum is 37.

The square root of 2561118238 is about 50607.4919157233. The cubic root of 2561118238 is about 1368.1799116885.

The spelling of 2561118238 in words is "two billion, five hundred sixty-one million, one hundred eighteen thousand, two hundred thirty-eight".