261147927 has 4 divisors (see below), whose sum is σ = 348197240. Its totient is φ = 174098616.

The previous prime is 261147889. The next prime is 261147947. The reversal of 261147927 is 729741162.

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

It is not a de Polignac number, because 261147927 - 2¹⁹ = 260623639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261147947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43524652 + ... + 43524657.

It is an arithmetic number, because the mean of its divisors is an integer number (87049310).

Almost surely, 2^261147927 is an apocalyptic number.

261147927 is a deficient number, since it is larger than the sum of its proper divisors (87049313).

261147927 is an equidigital number, since it uses as much as digits as its factorization.

261147927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87049312.

The product of its digits is 42336, while the sum is 39.

The square root of 261147927 is about 16160.0719986020. The cubic root of 261147927 is about 639.1883648532.

The spelling of 261147927 in words is "two hundred sixty-one million, one hundred forty-seven thousand, nine hundred twenty-seven".