2581261933 has 2 divisors, whose sum is σ = 2581261934. Its totient is φ = 2581261932.

The previous prime is 2581261931. The next prime is 2581261951. The reversal of 2581261933 is 3391621852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2564105769 + 17156164 = 50637^2 + 4142^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581261933 - 2¹ = 2581261931 is a prime.

Together with 2581261931, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581261931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290630966 + 1290630967.

It is an arithmetic number, because the mean of its divisors is an integer number (1290630967).

Almost surely, 2^2581261933 is an apocalyptic number.

It is an amenable number.

2581261933 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581261933 is an equidigital number, since it uses as much as digits as its factorization.

2581261933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 2581261933 is about 50806.1210190268. The cubic root of 2581261933 is about 1371.7575491267.

The spelling of 2581261933 in words is "two billion, five hundred eighty-one million, two hundred sixty-one thousand, nine hundred thirty-three".