261220741 has 4 divisors (see below), whose sum is σ = 261274572. Its totient is φ = 261166912.

The previous prime is 261220697. The next prime is 261220747. The reversal of 261220741 is 147022162.

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 189750625 + 71470116 = 13775^2 + 8454^2 .

It is a cyclic number.

It is not a de Polignac number, because 261220741 - 2¹⁵ = 261187973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261220747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18826 + ... + 29611.

It is an arithmetic number, because the mean of its divisors is an integer number (65318643).

Almost surely, 2^261220741 is an apocalyptic number.

It is an amenable number.

261220741 is a deficient number, since it is larger than the sum of its proper divisors (53831).

261220741 is an equidigital number, since it uses as much as digits as its factorization.

261220741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53830.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 261220741 is about 16162.3247399624. The cubic root of 261220741 is about 639.2477660990.

The spelling of 261220741 in words is "two hundred sixty-one million, two hundred twenty thousand, seven hundred forty-one".