261036100 has 36 divisors (see below), whose sum is σ = 610024324. Its totient is φ = 96382080.

The previous prime is 261036091. The next prime is 261036103. The reversal of 261036100 is 1630162.

It can be written as a sum of positive squares in 6 ways, for example, as 17239104 + 243796996 = 4152^2 + 15614^2 .

It is not an unprimeable number, because it can be changed into a prime (261036103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99099 + ... + 101698.

Almost surely, 2^261036100 is an apocalyptic number.

261036100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261036100 is an abundant number, since it is smaller than the sum of its proper divisors (348988224).

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

261036100 is a wasteful number, since it uses less digits than its factorization.

261036100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200824 (or 200817 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 261036100 is about 16156.6116497241. The cubic root of 261036100 is about 639.0971155203.

Adding to 261036100 its reverse (1630162), we get a palindrome (262666262).

The spelling of 261036100 in words is "two hundred sixty-one million, thirty-six thousand, one hundred".