261161892 has 36 divisors (see below), whose sum is σ = 674209536. Its totient is φ = 85201200.

The previous prime is 261161891. The next prime is 261161903. The reversal of 261161892 is 298161162.

261161892 is a `hidden beast` number, since 26 + 11 + 618 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (261161891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75484 + ... + 78867.

Almost surely, 2^261161892 is an apocalyptic number.

It is an amenable number.

261161892 is an abundant number, since it is smaller than the sum of its proper divisors (413047644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261161892 is a wasteful number, since it uses less digits than its factorization.

261161892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154408 (or 154403 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 261161892 is about 16160.5040762966. The cubic root of 261161892 is about 639.1997582762.

The spelling of 261161892 in words is "two hundred sixty-one million, one hundred sixty-one thousand, eight hundred ninety-two".