2561134237 has 4 divisors (see below), whose sum is σ = 2591991360. Its totient is φ = 2530277116.

The previous prime is 2561134231. The next prime is 2561134267. The reversal of 2561134237 is 7324311652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2561134237 - 2¹⁹ = 2560609949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561134231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15428437 + ... + 15428602.

It is an arithmetic number, because the mean of its divisors is an integer number (647997840).

Almost surely, 2^2561134237 is an apocalyptic number.

It is an amenable number.

2561134237 is a deficient number, since it is larger than the sum of its proper divisors (30857123).

2561134237 is an equidigital number, since it uses as much as digits as its factorization.

2561134237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30857122.

The product of its digits is 30240, while the sum is 34.

The square root of 2561134237 is about 50607.6499849578. The cubic root of 2561134237 is about 1368.1827606347.

Adding to 2561134237 its reverse (7324311652), we get a palindrome (9885445889).

The spelling of 2561134237 in words is "two billion, five hundred sixty-one million, one hundred thirty-four thousand, two hundred thirty-seven".