1930781123 has 2 divisors, whose sum is σ = 1930781124. Its totient is φ = 1930781122.

The previous prime is 1930781107. The next prime is 1930781147. The reversal of 1930781123 is 3211870391.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3211870391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1930781123 - 2⁴ = 1930781107 is a prime.

It is a super-2 number, since 2×1930781123² = 7455831489866282258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1930781423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965390561 + 965390562.

It is an arithmetic number, because the mean of its divisors is an integer number (965390562).

Almost surely, 2^1930781123 is an apocalyptic number.

1930781123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930781123 is an equidigital number, since it uses as much as digits as its factorization.

1930781123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1930781123 is about 43940.6545581652. The cubic root of 1930781123 is about 1245.2150127297.

The spelling of 1930781123 in words is "one billion, nine hundred thirty million, seven hundred eighty-one thousand, one hundred twenty-three".