261517283 has 2 divisors, whose sum is σ = 261517284. Its totient is φ = 261517282.

The previous prime is 261517247. The next prime is 261517327. The reversal of 261517283 is 382715162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261517283 - 2⁸ = 261517027 is a prime.

It is not a weakly prime, because it can be changed into another prime (261514283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130758641 + 130758642.

It is an arithmetic number, because the mean of its divisors is an integer number (130758642).

Almost surely, 2^261517283 is an apocalyptic number.

261517283 is a deficient number, since it is larger than the sum of its proper divisors (1).

261517283 is an equidigital number, since it uses as much as digits as its factorization.

261517283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 261517283 is about 16171.4960037716. The cubic root of 261517283 is about 639.4895694152.

The spelling of 261517283 in words is "two hundred sixty-one million, five hundred seventeen thousand, two hundred eighty-three".