261100400 has 60 divisors (see below), whose sum is σ = 684331944. Its totient is φ = 94944000.

The previous prime is 261100397. The next prime is 261100417. The reversal of 261100400 is 4001162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25271 + ... + 34070.

Almost surely, 2^261100400 is an apocalyptic number.

261100400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261100400 is an abundant number, since it is smaller than the sum of its proper divisors (423231544).

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

261100400 is a wasteful number, since it uses less digits than its factorization.

261100400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59370 (or 59359 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 261100400 is about 16158.6014246283. The cubic root of 261100400 is about 639.1495866418.

Adding to 261100400 its reverse (4001162), we get a palindrome (265101562).

The spelling of 261100400 in words is "two hundred sixty-one million, one hundred thousand, four hundred".