261210495 has 64 divisors (see below), whose sum is σ = 531062784. Its totient is φ = 106652160.

The previous prime is 261210487. The next prime is 261210503. The reversal of 261210495 is 594012162.

It is an interprime number because it is at equal distance from previous prime (261210487) and next prime (261210503).

It is not a de Polignac number, because 261210495 - 2³ = 261210487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39229 + ... + 45401.

It is an arithmetic number, because the mean of its divisors is an integer number (8297856).

Almost surely, 2^261210495 is an apocalyptic number.

261210495 is an abundant number, since it is smaller than the sum of its proper divisors (269852289).

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

261210495 is a wasteful number, since it uses less digits than its factorization.

261210495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 261210495 is about 16162.0077651262. The cubic root of 261210495 is about 639.2394081381.

The spelling of 261210495 in words is "two hundred sixty-one million, two hundred ten thousand, four hundred ninety-five".