1918249453 has 2 divisors, whose sum is σ = 1918249454. Its totient is φ = 1918249452.

The previous prime is 1918249447. The next prime is 1918249483. The reversal of 1918249453 is 3549428191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1419933124 + 498316329 = 37682^2 + 22323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918249453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918249483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959124726 + 959124727.

It is an arithmetic number, because the mean of its divisors is an integer number (959124727).

Almost surely, 2^1918249453 is an apocalyptic number.

It is an amenable number.

1918249453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918249453 is an equidigital number, since it uses as much as digits as its factorization.

1918249453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 1918249453 is about 43797.8247519212. The cubic root of 1918249453 is about 1242.5151544317.

It can be divided in two parts, 19182 and 49453, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 1918249453 in words is "one billion, nine hundred eighteen million, two hundred forty-nine thousand, four hundred fifty-three".