2001826261 has 2 divisors, whose sum is σ = 2001826262. Its totient is φ = 2001826260.

The previous prime is 2001826259. The next prime is 2001826289. The reversal of 2001826261 is 1626281002.

It is an a-pointer prime, because the next prime (2001826289) can be obtained adding 2001826261 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1731059236 + 270767025 = 41606^2 + 16455^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001826261 - 2¹ = 2001826259 is a prime.

Together with 2001826259, 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 (2001826231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000913130 + 1000913131.

It is an arithmetic number, because the mean of its divisors is an integer number (1000913131).

Almost surely, 2^2001826261 is an apocalyptic number.

It is an amenable number.

2001826261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001826261 is an equidigital number, since it uses as much as digits as its factorization.

2001826261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 2001826261 is about 44741.7731097014. The cubic root of 2001826261 is about 1260.3044240078.

The spelling of 2001826261 in words is "two billion, one million, eight hundred twenty-six thousand, two hundred sixty-one".