261142847 has 4 divisors (see below), whose sum is σ = 298448976. Its totient is φ = 223836720.

The previous prime is 261142841. The next prime is 261142877. The reversal of 261142847 is 748241162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261142847 - 2⁸ = 261142591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261142841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18653054 + ... + 18653067.

It is an arithmetic number, because the mean of its divisors is an integer number (74612244).

Almost surely, 2^261142847 is an apocalyptic number.

261142847 is a deficient number, since it is larger than the sum of its proper divisors (37306129).

261142847 is an equidigital number, since it uses as much as digits as its factorization.

261142847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37306128.

The product of its digits is 21504, while the sum is 35.

The square root of 261142847 is about 16159.9148203201. The cubic root of 261142847 is about 639.1842202061.

The spelling of 261142847 in words is "two hundred sixty-one million, one hundred forty-two thousand, eight hundred forty-seven".