2089261781 has 2 divisors, whose sum is σ = 2089261782. Its totient is φ = 2089261780.

The previous prime is 2089261693. The next prime is 2089261841. The reversal of 2089261781 is 1871629802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1639440100 + 449821681 = 40490^2 + 21209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2089261781 - 2¹⁰ = 2089260757 is a prime.

It is a super-2 number, since 2×2089261781² = 8730029579094583922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2089261381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1044630890 + 1044630891.

It is an arithmetic number, because the mean of its divisors is an integer number (1044630891).

Almost surely, 2^2089261781 is an apocalyptic number.

It is an amenable number.

2089261781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2089261781 is an equidigital number, since it uses as much as digits as its factorization.

2089261781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 2089261781 is about 45708.4432134808. The cubic root of 2089261781 is about 1278.3927134218.

The spelling of 2089261781 in words is "two billion, eighty-nine million, two hundred sixty-one thousand, seven hundred eighty-one".