2361781 has 2 divisors, whose sum is σ = 2361782. Its totient is φ = 2361780.

The previous prime is 2361773. The next prime is 2361803. The reversal of 2361781 is 1871632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 443556 = 1385^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2361781 - 2³ = 2361773 is a prime.

It is a super-2 number, since 2×2361781² = 11156018983922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2361701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1180890 + 1180891.

It is an arithmetic number, because the mean of its divisors is an integer number (1180891).

2^2361781 is an apocalyptic number.

It is an amenable number.

2361781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2361781 is an equidigital number, since it uses as much as digits as its factorization.

2361781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 2361781 is about 1536.8087063783. The cubic root of 2361781 is about 133.1720877164.

The spelling of 2361781 in words is "two million, three hundred sixty-one thousand, seven hundred eighty-one".