261338699 has 4 divisors (see below), whose sum is σ = 263092800. Its totient is φ = 259584600.

The previous prime is 261338677. The next prime is 261338723. The reversal of 261338699 is 996833162.

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 261338699 - 2¹² = 261334603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261338639) 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, 876827 + ... + 877124.

It is an arithmetic number, because the mean of its divisors is an integer number (65773200).

Almost surely, 2^261338699 is an apocalyptic number.

261338699 is a deficient number, since it is larger than the sum of its proper divisors (1754101).

261338699 is a wasteful number, since it uses less digits than its factorization.

261338699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754100.

The product of its digits is 419904, while the sum is 47.

The square root of 261338699 is about 16165.9734937306. The cubic root of 261338699 is about 639.3439721411.

The spelling of 261338699 in words is "two hundred sixty-one million, three hundred thirty-eight thousand, six hundred ninety-nine".