291028119817 has 2 divisors, whose sum is σ = 291028119818. Its totient is φ = 291028119816.

The previous prime is 291028119769. The next prime is 291028119841. The reversal of 291028119817 is 718911820192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178655000976 + 112373118841 = 422676^2 + 335221^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291028119817 is a prime.

It is a super-2 number, since 2×291028119817² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (291028119917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145514059908 + 145514059909.

It is an arithmetic number, because the mean of its divisors is an integer number (145514059909).

Almost surely, 2^291028119817 is an apocalyptic number.

It is an amenable number.

291028119817 is a deficient number, since it is larger than the sum of its proper divisors (1).

291028119817 is an equidigital number, since it uses as much as digits as its factorization.

291028119817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 49.

The spelling of 291028119817 in words is "two hundred ninety-one billion, twenty-eight million, one hundred nineteen thousand, eight hundred seventeen".