261340136 has 16 divisors (see below), whose sum is σ = 515803200. Its totient is φ = 123792624.

The previous prime is 261340127. The next prime is 261340147. The reversal of 261340136 is 631043162.

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, 859520 + ... + 859823.

It is an arithmetic number, because the mean of its divisors is an integer number (32237700).

Almost surely, 2^261340136 is an apocalyptic number.

It is an amenable number.

261340136 is a deficient number, since it is larger than the sum of its proper divisors (254463064).

261340136 is a wasteful number, since it uses less digits than its factorization.

261340136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719368 (or 1719364 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 261340136 is about 16166.0179388741. The cubic root of 261340136 is about 639.3451439737.

Adding to 261340136 its reverse (631043162), we get a palindrome (892383298).

The spelling of 261340136 in words is "two hundred sixty-one million, three hundred forty thousand, one hundred thirty-six".