261402041 has 4 divisors (see below), whose sum is σ = 265303632. Its totient is φ = 257500452.

The previous prime is 261402023. The next prime is 261402059. The reversal of 261402041 is 140204162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (261402023) and next prime (261402059).

It is a cyclic number.

It is not a de Polignac number, because 261402041 - 2¹⁰ = 261401017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261402091) 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 3 ways as a sum of consecutive naturals, for example, 1950695 + ... + 1950828.

It is an arithmetic number, because the mean of its divisors is an integer number (66325908).

Almost surely, 2^261402041 is an apocalyptic number.

It is an amenable number.

261402041 is a deficient number, since it is larger than the sum of its proper divisors (3901591).

261402041 is an equidigital number, since it uses as much as digits as its factorization.

261402041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901590.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 261402041 is about 16167.9324899630. The cubic root of 261402041 is about 639.3956216604.

The spelling of 261402041 in words is "two hundred sixty-one million, four hundred two thousand, forty-one".