261004120 has 32 divisors (see below), whose sum is σ = 632434320. Its totient is φ = 96370560.

The previous prime is 261004103. The next prime is 261004151. The reversal of 261004120 is 21400162.

It is a junction number, because it is equal to n+sod(n) for n = 261004094 and 261004103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250446 + ... + 251485.

Almost surely, 2^261004120 is an apocalyptic number.

261004120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261004120 is an abundant number, since it is smaller than the sum of its proper divisors (371430200).

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

261004120 is a wasteful number, since it uses less digits than its factorization.

261004120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501955 (or 501951 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 261004120 is about 16155.6219316992. The cubic root of 261004120 is about 639.0710154771.

Adding to 261004120 its reverse (21400162), we get a palindrome (282404282).

The spelling of 261004120 in words is "two hundred sixty-one million, four thousand, one hundred twenty".