261942941 has 4 divisors (see below), whose sum is σ = 282092412. Its totient is φ = 241793472.

The previous prime is 261942913. The next prime is 261942979. The reversal of 261942941 is 149249162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84254041 + 177688900 = 9179^2 + 13330^2 .

It is a cyclic number.

It is not a de Polignac number, because 261942941 - 2¹⁴ = 261926557 is a prime.

It is a super-2 number, since 2×261942941² = 137228208679458962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261942895 and 261942904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261942641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10074716 + ... + 10074741.

It is an arithmetic number, because the mean of its divisors is an integer number (70523103).

Almost surely, 2^261942941 is an apocalyptic number.

It is an amenable number.

261942941 is a deficient number, since it is larger than the sum of its proper divisors (20149471).

261942941 is a wasteful number, since it uses less digits than its factorization.

261942941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20149470.

The product of its digits is 31104, while the sum is 38.

The square root of 261942941 is about 16184.6514018684. The cubic root of 261942941 is about 639.8363359175.

The spelling of 261942941 in words is "two hundred sixty-one million, nine hundred forty-two thousand, nine hundred forty-one".