1913448973 has 2 divisors, whose sum is σ = 1913448974. Its totient is φ = 1913448972.

The previous prime is 1913448949. The next prime is 1913448989. The reversal of 1913448973 is 3798443191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1285796164 + 627652809 = 35858^2 + 25053^2 .

It is an emirp because it is prime and its reverse (3798443191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913448973 is a prime.

It is a super-2 number, since 2×1913448973² = 7322573944549509458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913448773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956724486 + 956724487.

It is an arithmetic number, because the mean of its divisors is an integer number (956724487).

Almost surely, 2^1913448973 is an apocalyptic number.

It is an amenable number.

1913448973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913448973 is an equidigital number, since it uses as much as digits as its factorization.

1913448973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 1913448973 is about 43742.9877008876. The cubic root of 1913448973 is about 1241.4778107814.

The spelling of 1913448973 in words is "one billion, nine hundred thirteen million, four hundred forty-eight thousand, nine hundred seventy-three".