1794798781 has 2 divisors, whose sum is σ = 1794798782. Its totient is φ = 1794798780.

The previous prime is 1794798779. The next prime is 1794798787. The reversal of 1794798781 is 1878974971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1619660025 + 175138756 = 40245^2 + 13234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1794798781 - 2¹ = 1794798779 is a prime.

It is a super-2 number, since 2×1794798781² = 6442605328558171922, which contains 22 as substring.

Together with 1794798779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1794798787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 897399390 + 897399391.

It is an arithmetic number, because the mean of its divisors is an integer number (897399391).

Almost surely, 2^1794798781 is an apocalyptic number.

It is an amenable number.

1794798781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1794798781 is an equidigital number, since it uses as much as digits as its factorization.

1794798781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 61.

The square root of 1794798781 is about 42365.0655729458. The cubic root of 1794798781 is about 1215.2676071171.

The spelling of 1794798781 in words is "one billion, seven hundred ninety-four million, seven hundred ninety-eight thousand, seven hundred eighty-one".