261062321 has 16 divisors (see below), whose sum is σ = 291589200. Its totient is φ = 232071168.

The previous prime is 261062317. The next prime is 261062323. The reversal of 261062321 is 123260162.

It can be written as a sum of positive squares in 8 ways, for example, as 49505296 + 211557025 = 7036^2 + 14545^2 .

It is a cyclic number.

It is not a de Polignac number, because 261062321 - 2² = 261062317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261062323) 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 in 15 ways as a sum of consecutive naturals, for example, 213905 + ... + 215121.

It is an arithmetic number, because the mean of its divisors is an integer number (18224325).

Almost surely, 2^261062321 is an apocalyptic number.

It is an amenable number.

261062321 is a deficient number, since it is larger than the sum of its proper divisors (30526879).

261062321 is a wasteful number, since it uses less digits than its factorization.

261062321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 261062321 is about 16157.4230928078. The cubic root of 261062321 is about 639.1185138433.

The spelling of 261062321 in words is "two hundred sixty-one million, sixty-two thousand, three hundred twenty-one".