1918650973 has 2 divisors, whose sum is σ = 1918650974. Its totient is φ = 1918650972.

The previous prime is 1918650953. The next prime is 1918650983. The reversal of 1918650973 is 3790568191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1463980644 + 454670329 = 38262^2 + 21323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1918650973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918650953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959325486 + 959325487.

It is an arithmetic number, because the mean of its divisors is an integer number (959325487).

Almost surely, 2^1918650973 is an apocalyptic number.

It is an amenable number.

1918650973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918650973 is an equidigital number, since it uses as much as digits as its factorization.

1918650973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1918650973 is about 43802.4083013708. The cubic root of 1918650973 is about 1242.6018410857.

The spelling of 1918650973 in words is "one billion, nine hundred eighteen million, six hundred fifty thousand, nine hundred seventy-three".