261111000 has 64 divisors (see below), whose sum is σ = 814675680. Its totient is φ = 69628800.

The previous prime is 261110989. The next prime is 261111029. The reversal of 261111000 is 111162.

It is a happy number.

261111000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40519 + ... + 46518.

Almost surely, 2^261111000 is an apocalyptic number.

261111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261111000 is an abundant number, since it is smaller than the sum of its proper divisors (553564680).

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

261111000 is a wasteful number, since it uses less digits than its factorization.

261111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87061 (or 87047 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 261111000 is about 16158.9294199832. The cubic root of 261111000 is about 639.1582357974.

Adding to 261111000 its reverse (111162), we get a palindrome (261222162).

The spelling of 261111000 in words is "two hundred sixty-one million, one hundred eleven thousand".