261161608 has 16 divisors (see below), whose sum is σ = 505474560. Its totient is φ = 126368400.

The previous prime is 261161587. The next prime is 261161623. The reversal of 261161608 is 806161162.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 261161608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526288 + ... + 526783.

It is an arithmetic number, because the mean of its divisors is an integer number (31592160).

Almost surely, 2^261161608 is an apocalyptic number.

It is an amenable number.

261161608 is a deficient number, since it is larger than the sum of its proper divisors (244312952).

261161608 is a wasteful number, since it uses less digits than its factorization.

261161608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053108 (or 1053104 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 261161608 is about 16160.4952894396. The cubic root of 261161608 is about 639.1995265772.

The spelling of 261161608 in words is "two hundred sixty-one million, one hundred sixty-one thousand, six hundred eight".