261591116 has 6 divisors (see below), whose sum is σ = 457784460. Its totient is φ = 130795556.

The previous prime is 261591101. The next prime is 261591131. The reversal of 261591116 is 611195162.

261591116 is digitally balanced in base 2, because in such base 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 (261591101) and next prime (261591131).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32698886 + ... + 32698893.

It is an arithmetic number, because the mean of its divisors is an integer number (76297410).

Almost surely, 2^261591116 is an apocalyptic number.

It is an amenable number.

261591116 is a deficient number, since it is larger than the sum of its proper divisors (196193344).

261591116 is a wasteful number, since it uses less digits than its factorization.

261591116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65397783 (or 65397781 counting only the distinct ones).

The product of its digits is 3240, while the sum is 32.

The square root of 261591116 is about 16173.7786555894. The cubic root of 261591116 is about 639.5497451585.

The spelling of 261591116 in words is "two hundred sixty-one million, five hundred ninety-one thousand, one hundred sixteen".