261838043 has 2 divisors, whose sum is σ = 261838044. Its totient is φ = 261838042.

The previous prime is 261838033. The next prime is 261838067. The reversal of 261838043 is 340838162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261838043 - 2¹² = 261833947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261837994 and 261838012.

It is not a weakly prime, because it can be changed into another prime (261838033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130919021 + 130919022.

It is an arithmetic number, because the mean of its divisors is an integer number (130919022).

Almost surely, 2^261838043 is an apocalyptic number.

261838043 is a deficient number, since it is larger than the sum of its proper divisors (1).

261838043 is an equidigital number, since it uses as much as digits as its factorization.

261838043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 261838043 is about 16181.4104144231. The cubic root of 261838043 is about 639.7509146256.

The spelling of 261838043 in words is "two hundred sixty-one million, eight hundred thirty-eight thousand, forty-three".