261994825 has 12 divisors (see below), whose sum is σ = 325189008. Its totient is φ = 209392400.

The previous prime is 261994823. The next prime is 261994841. The reversal of 261994825 is 528499162.

It is not a de Polignac number, because 261994825 - 2¹ = 261994823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261994823) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 24570 + ... + 33580.

It is an arithmetic number, because the mean of its divisors is an integer number (27099084).

Almost surely, 2^261994825 is an apocalyptic number.

261994825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261994825 is a deficient number, since it is larger than the sum of its proper divisors (63194183).

261994825 is a wasteful number, since it uses less digits than its factorization.

261994825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10184 (or 10179 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 261994825 is about 16186.2541991654. The cubic root of 261994825 is about 639.8785780393.

The spelling of 261994825 in words is "two hundred sixty-one million, nine hundred ninety-four thousand, eight hundred twenty-five".