261098540 has 12 divisors (see below), whose sum is σ = 548306976. Its totient is φ = 104439408.

The previous prime is 261098527. The next prime is 261098549. The reversal of 261098540 is 45890162.

It is a self number, because there is not a number n which added to its sum of digits gives 261098540.

It is not an unprimeable number, because it can be changed into a prime (261098549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6527444 + ... + 6527483.

It is an arithmetic number, because the mean of its divisors is an integer number (45692248).

Almost surely, 2^261098540 is an apocalyptic number.

261098540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261098540 is an abundant number, since it is smaller than the sum of its proper divisors (287208436).

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

261098540 is a wasteful number, since it uses less digits than its factorization.

261098540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13054936 (or 13054934 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 261098540 is about 16158.5438700398. The cubic root of 261098540 is about 639.1480689357.

The spelling of 261098540 in words is "two hundred sixty-one million, ninety-eight thousand, five hundred forty".