261371900 has 18 divisors (see below), whose sum is σ = 567177240. Its totient is φ = 104548720.

The previous prime is 261371899. The next prime is 261371909. The reversal of 261371900 is 9173162.

261371900 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261371900² = 136630540219220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261371909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1306760 + ... + 1306959.

Almost surely, 2^261371900 is an apocalyptic number.

261371900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261371900 is an abundant number, since it is smaller than the sum of its proper divisors (305805340).

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

261371900 is a wasteful number, since it uses less digits than its factorization.

261371900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613733 (or 2613726 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 261371900 is about 16167.0003401992. Note that the first 3 decimals coincide. The cubic root of 261371900 is about 639.3710455143.

The spelling of 261371900 in words is "two hundred sixty-one million, three hundred seventy-one thousand, nine hundred".