1930144781 has 2 divisors, whose sum is σ = 1930144782. Its totient is φ = 1930144780.

The previous prime is 1930144763. The next prime is 1930144813. The reversal of 1930144781 is 1874410391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926419881 + 3724900 = 43891^2 + 1930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1930144781 is a prime.

It is a super-2 number, since 2×1930144781² = 7450917751243075922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1930144481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965072390 + 965072391.

It is an arithmetic number, because the mean of its divisors is an integer number (965072391).

Almost surely, 2^1930144781 is an apocalyptic number.

It is an amenable number.

1930144781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930144781 is an equidigital number, since it uses as much as digits as its factorization.

1930144781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1930144781 is about 43933.4130360936. The cubic root of 1930144781 is about 1245.0781994182.

The spelling of 1930144781 in words is "one billion, nine hundred thirty million, one hundred forty-four thousand, seven hundred eighty-one".