261063887 has 16 divisors (see below), whose sum is σ = 309450240. Its totient is φ = 215490912.

The previous prime is 261063877. The next prime is 261063937. The reversal of 261063887 is 788360162.

It is a happy number.

It is not a de Polignac number, because 261063887 - 2⁴ = 261063871 is a prime.

It is a super-3 number, since 3×261063887³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261063877) 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 15 ways as a sum of consecutive naturals, for example, 88478 + ... + 91380.

It is an arithmetic number, because the mean of its divisors is an integer number (19340640).

Almost surely, 2^261063887 is an apocalyptic number.

261063887 is a deficient number, since it is larger than the sum of its proper divisors (48386353).

261063887 is a wasteful number, since it uses less digits than its factorization.

261063887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 261063887 is about 16157.4715534331. The cubic root of 261063887 is about 639.1197917726.

The spelling of 261063887 in words is "two hundred sixty-one million, sixty-three thousand, eight hundred eighty-seven".