261365854 has 16 divisors (see below), whose sum is σ = 426331728. Its totient is φ = 119670912.

The previous prime is 261365851. The next prime is 261365869. The reversal of 261365854 is 458563162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261365851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102624 + ... + 105139.

It is an arithmetic number, because the mean of its divisors is an integer number (26645733).

Almost surely, 2^261365854 is an apocalyptic number.

261365854 is a deficient number, since it is larger than the sum of its proper divisors (164965874).

261365854 is a wasteful number, since it uses less digits than its factorization.

261365854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207819.

The product of its digits is 172800, while the sum is 40.

The square root of 261365854 is about 16166.8133532864. The cubic root of 261365854 is about 639.3661155440.

The spelling of 261365854 in words is "two hundred sixty-one million, three hundred sixty-five thousand, eight hundred fifty-four".