1011958505197 has 2 divisors, whose sum is σ = 1011958505198. Its totient is φ = 1011958505196.

The previous prime is 1011958505167. The next prime is 1011958505417. The reversal of 1011958505197 is 7915058591101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839543382756 + 172415122441 = 916266^2 + 415229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011958505197 - 2¹⁵ = 1011958472429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011958505167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505979252598 + 505979252599.

It is an arithmetic number, because the mean of its divisors is an integer number (505979252599).

Almost surely, 2^{1011958505197} is an apocalyptic number.

It is an amenable number.

1011958505197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011958505197 is an equidigital number, since it uses as much as digits as its factorization.

1011958505197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 52.

The spelling of 1011958505197 in words is "one trillion, eleven billion, nine hundred fifty-eight million, five hundred five thousand, one hundred ninety-seven".