291863053 has 2 divisors, whose sum is σ = 291863054. Its totient is φ = 291863052.

The previous prime is 291863041. The next prime is 291863071. The reversal of 291863053 is 350368192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245799684 + 46063369 = 15678^2 + 6787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291863053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291863083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145931526 + 145931527.

It is an arithmetic number, because the mean of its divisors is an integer number (145931527).

Almost surely, 2^291863053 is an apocalyptic number.

It is an amenable number.

291863053 is a deficient number, since it is larger than the sum of its proper divisors (1).

291863053 is an equidigital number, since it uses as much as digits as its factorization.

291863053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 291863053 is about 17083.9999121985. Note that the first 4 decimals coincide. The cubic root of 291863053 is about 663.3250121989.

The spelling of 291863053 in words is "two hundred ninety-one million, eight hundred sixty-three thousand, fifty-three".