2581261937 has 4 divisors (see below), whose sum is σ = 2587011300. Its totient is φ = 2575512576.

The previous prime is 2581261933. The next prime is 2581261951. The reversal of 2581261937 is 7391621852.

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

It can be written as a sum of positive squares in 2 ways, for example, as 609546721 + 1971715216 = 24689^2 + 44404^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581261937 - 2² = 2581261933 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581261931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2874008 + ... + 2874905.

It is an arithmetic number, because the mean of its divisors is an integer number (646752825).

Almost surely, 2^2581261937 is an apocalyptic number.

It is an amenable number.

2581261937 is a deficient number, since it is larger than the sum of its proper divisors (5749363).

2581261937 is an equidigital number, since it uses as much as digits as its factorization.

2581261937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749362.

The product of its digits is 181440, while the sum is 44.

The square root of 2581261937 is about 50806.1210583922. The cubic root of 2581261937 is about 1371.7575498352.

The spelling of 2581261937 in words is "two billion, five hundred eighty-one million, two hundred sixty-one thousand, nine hundred thirty-seven".