291251222051 has 2 divisors, whose sum is σ = 291251222052. Its totient is φ = 291251222050.

The previous prime is 291251222047. The next prime is 291251222077. The reversal of 291251222051 is 150222152192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291251222051 - 2² = 291251222047 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 291251221999 and 291251222017.

It is not a weakly prime, because it can be changed into another prime (291251227051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145625611025 + 145625611026.

It is an arithmetic number, because the mean of its divisors is an integer number (145625611026).

Almost surely, 2^291251222051 is an apocalyptic number.

291251222051 is a deficient number, since it is larger than the sum of its proper divisors (1).

291251222051 is an equidigital number, since it uses as much as digits as its factorization.

291251222051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 291251222051 in words is "two hundred ninety-one billion, two hundred fifty-one million, two hundred twenty-two thousand, fifty-one".