261004254 has 64 divisors (see below), whose sum is σ = 641433600. Its totient is φ = 69134688.

The previous prime is 261004243. The next prime is 261004279. The reversal of 261004254 is 452400162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34027 + ... + 40985.

It is an arithmetic number, because the mean of its divisors is an integer number (10022400).

Almost surely, 2^261004254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261004254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320716800).

261004254 is an abundant number, since it is smaller than the sum of its proper divisors (380429346).

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

261004254 is a wasteful number, since it uses less digits than its factorization.

261004254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 261004254 is about 16155.6260788618. The cubic root of 261004254 is about 639.0711248438.

The spelling of 261004254 in words is "two hundred sixty-one million, four thousand, two hundred fifty-four".