291611249 has 2 divisors, whose sum is σ = 291611250. Its totient is φ = 291611248.

The previous prime is 291611233. The next prime is 291611261. The reversal of 291611249 is 942116192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262666849 + 28944400 = 16207^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 291611249 - 2⁴ = 291611233 is a prime.

It is not a weakly prime, because it can be changed into another prime (291611219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145805624 + 145805625.

It is an arithmetic number, because the mean of its divisors is an integer number (145805625).

Almost surely, 2^291611249 is an apocalyptic number.

It is an amenable number.

291611249 is a deficient number, since it is larger than the sum of its proper divisors (1).

291611249 is an equidigital number, since it uses as much as digits as its factorization.

291611249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 291611249 is about 17076.6287363753. The cubic root of 291611249 is about 663.1341967383.

The spelling of 291611249 in words is "two hundred ninety-one million, six hundred eleven thousand, two hundred forty-nine".