291125993 has 2 divisors, whose sum is σ = 291125994. Its totient is φ = 291125992.

The previous prime is 291125963. The next prime is 291126007. The reversal of 291125993 is 399521192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277788889 + 13337104 = 16667^2 + 3652^2 .

It is a cyclic number.

It is not a de Polignac number, because 291125993 - 2²⁴ = 274348777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 291125993.

It is not a weakly prime, because it can be changed into another prime (291125963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145562996 + 145562997.

It is an arithmetic number, because the mean of its divisors is an integer number (145562997).

Almost surely, 2^291125993 is an apocalyptic number.

It is an amenable number.

291125993 is a deficient number, since it is larger than the sum of its proper divisors (1).

291125993 is an equidigital number, since it uses as much as digits as its factorization.

291125993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 41.

The square root of 291125993 is about 17062.4146298231. The cubic root of 291125993 is about 662.7661628054.

The spelling of 291125993 in words is "two hundred ninety-one million, one hundred twenty-five thousand, nine hundred ninety-three".