291041261 has 4 divisors (see below), whose sum is σ = 332618592. Its totient is φ = 249463932.

The previous prime is 291041239. The next prime is 291041269. The reversal of 291041261 is 162140192.

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 a cyclic number.

It is not a de Polignac number, because 291041261 - 2⁶ = 291041197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291041261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291041269) 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, 20788655 + ... + 20788668.

It is an arithmetic number, because the mean of its divisors is an integer number (83154648).

Almost surely, 2^291041261 is an apocalyptic number.

It is an amenable number.

291041261 is a deficient number, since it is larger than the sum of its proper divisors (41577331).

291041261 is an equidigital number, since it uses as much as digits as its factorization.

291041261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41577330.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 291041261 is about 17059.9314476935. The cubic root of 291041261 is about 662.7018573695.

The spelling of 291041261 in words is "two hundred ninety-one million, forty-one thousand, two hundred sixty-one".