291321078050 has 54 divisors (see below), whose sum is σ = 557167876083. Its totient is φ = 113324055840.

The previous prime is 291321078047. The next prime is 291321078053. The reversal of 291321078050 is 50870123192.

It is an interprime number because it is at equal distance from previous prime (291321078047) and next prime (291321078053).

It can be written as a sum of positive squares in 5 ways, for example, as 231052301041 + 60268777009 = 480679^2 + 245497^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=381655.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 291321077995 and 291321078013.

It is not an unprimeable number, because it can be changed into a prime (291321078053) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 141211319 + ... + 141213381.

Almost surely, 2^291321078050 is an apocalyptic number.

291321078050 is a deficient number, since it is larger than the sum of its proper divisors (265846798033).

291321078050 is an frugal number, since it uses more digits than its factorization.

291321078050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 291321078050 in words is "two hundred ninety-one billion, three hundred twenty-one million, seventy-eight thousand, fifty".