261083216 has 20 divisors (see below), whose sum is σ = 507825012. Its totient is φ = 130031616.

The previous prime is 261083213. The next prime is 261083219. The reversal of 261083216 is 612380162.

261083216 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261083213) and next prime (261083219).

It can be written as a sum of positive squares in 2 ways, for example, as 136983616 + 124099600 = 11704^2 + 11140^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261083213) 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, 27635 + ... + 35858.

Almost surely, 2^261083216 is an apocalyptic number.

It is an amenable number.

261083216 is a deficient number, since it is larger than the sum of its proper divisors (246741796).

261083216 is a wasteful number, since it uses less digits than its factorization.

261083216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63758 (or 63752 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 261083216 is about 16158.0696866922. The cubic root of 261083216 is about 639.1355647210.

The spelling of 261083216 in words is "two hundred sixty-one million, eighty-three thousand, two hundred sixteen".