261433247 has 2 divisors, whose sum is σ = 261433248. Its totient is φ = 261433246.

The previous prime is 261433243. The next prime is 261433267. The reversal of 261433247 is 742334162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261433247 - 2² = 261433243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261433241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130716623 + 130716624.

It is an arithmetic number, because the mean of its divisors is an integer number (130716624).

Almost surely, 2^261433247 is an apocalyptic number.

261433247 is a deficient number, since it is larger than the sum of its proper divisors (1).

261433247 is an equidigital number, since it uses as much as digits as its factorization.

261433247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 32.

The square root of 261433247 is about 16168.8975196208. The cubic root of 261433247 is about 639.4210641878.

The spelling of 261433247 in words is "two hundred sixty-one million, four hundred thirty-three thousand, two hundred forty-seven".