261942425 has 12 divisors (see below), whose sum is σ = 333588396. Its totient is φ = 203889600.

The previous prime is 261942407. The next prime is 261942431. The reversal of 261942425 is 524249162.

It can be written as a sum of positive squares in 6 ways, for example, as 12902464 + 249039961 = 3592^2 + 15781^2 .

It is not a de Polignac number, because 261942425 - 2⁶ = 261942361 is a prime.

It is a super-2 number, since 2×261942425² = 137227668029761250, which contains 22 as substring.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 140666 + ... + 142515.

It is an arithmetic number, because the mean of its divisors is an integer number (27799033).

Almost surely, 2^261942425 is an apocalyptic number.

261942425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261942425 is a deficient number, since it is larger than the sum of its proper divisors (71645971).

261942425 is a wasteful number, since it uses less digits than its factorization.

261942425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283228 (or 283223 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 261942425 is about 16184.6354608314. The cubic root of 261942425 is about 639.8359157805.

The spelling of 261942425 in words is "two hundred sixty-one million, nine hundred forty-two thousand, four hundred twenty-five".