261516043 has 2 divisors, whose sum is σ = 261516044. Its totient is φ = 261516042.

The previous prime is 261516041. The next prime is 261516053. The reversal of 261516043 is 340615162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261516043 - 2¹ = 261516041 is a prime.

Together with 261516041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261516041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130758021 + 130758022.

It is an arithmetic number, because the mean of its divisors is an integer number (130758022).

Almost surely, 2^261516043 is an apocalyptic number.

261516043 is a deficient number, since it is larger than the sum of its proper divisors (1).

261516043 is an equidigital number, since it uses as much as digits as its factorization.

261516043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261516043 is about 16171.4576646634. The cubic root of 261516043 is about 639.4885586874.

The spelling of 261516043 in words is "two hundred sixty-one million, five hundred sixteen thousand, forty-three".