261205036 has 12 divisors (see below), whose sum is σ = 464856840. Its totient is φ = 128388800.

The previous prime is 261205003. The next prime is 261205069. The reversal of 261205036 is 630502162.

261205036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261205003) and next prime (261205069).

It is a super-2 number, since 2×261205036² = 136456141663522592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261205036.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553165 + ... + 553636.

It is an arithmetic number, because the mean of its divisors is an integer number (38738070).

Almost surely, 2^261205036 is an apocalyptic number.

It is an amenable number.

261205036 is a deficient number, since it is larger than the sum of its proper divisors (203651804).

261205036 is a wasteful number, since it uses less digits than its factorization.

261205036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106864 (or 1106862 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 261205036 is about 16161.8388805235. The cubic root of 261205036 is about 639.2349549833.

Adding to 261205036 its reverse (630502162), we get a palindrome (891707198).

The spelling of 261205036 in words is "two hundred sixty-one million, two hundred five thousand, thirty-six".