291048409 has 2 divisors, whose sum is σ = 291048410. Its totient is φ = 291048408.

The previous prime is 291048397. The next prime is 291048419. The reversal of 291048409 is 904840192.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209091600 + 81956809 = 14460^2 + 9053^2 .

It is a cyclic number.

It is not a de Polignac number, because 291048409 - 2⁵ = 291048377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291048419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145524204 + 145524205.

It is an arithmetic number, because the mean of its divisors is an integer number (145524205).

Almost surely, 2^291048409 is an apocalyptic number.

It is an amenable number.

291048409 is a deficient number, since it is larger than the sum of its proper divisors (1).

291048409 is an equidigital number, since it uses as much as digits as its factorization.

291048409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 291048409 is about 17060.1409431458. The cubic root of 291048409 is about 662.7072826646.

The spelling of 291048409 in words is "two hundred ninety-one million, forty-eight thousand, four hundred nine".