1934077781 has 2 divisors, whose sum is σ = 1934077782. Its totient is φ = 1934077780.

The previous prime is 1934077757. The next prime is 1934077787. The reversal of 1934077781 is 1877704391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079451025 + 854626756 = 32855^2 + 29234^2 .

It is an emirp because it is prime and its reverse (1877704391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1934077781 is a prime.

It is a super-2 number, since 2×1934077781² = 7481313725915767922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1934077787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967038890 + 967038891.

It is an arithmetic number, because the mean of its divisors is an integer number (967038891).

Almost surely, 2^1934077781 is an apocalyptic number.

It is an amenable number.

1934077781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1934077781 is an equidigital number, since it uses as much as digits as its factorization.

1934077781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 1934077781 is about 43978.1511776018. The cubic root of 1934077781 is about 1245.9233122272.

The spelling of 1934077781 in words is "one billion, nine hundred thirty-four million, seventy-seven thousand, seven hundred eighty-one".