1994277469 has 2 divisors, whose sum is σ = 1994277470. Its totient is φ = 1994277468.

The previous prime is 1994277431. The next prime is 1994277473. The reversal of 1994277469 is 9647724991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1964705625 + 29571844 = 44325^2 + 5438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1994277469 is a prime.

It is a super-2 number, since 2×1994277469² = 7954285246722091922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994277409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997138734 + 997138735.

It is an arithmetic number, because the mean of its divisors is an integer number (997138735).

Almost surely, 2^1994277469 is an apocalyptic number.

It is an amenable number.

1994277469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994277469 is an equidigital number, since it uses as much as digits as its factorization.

1994277469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 58.

The square root of 1994277469 is about 44657.3338769793. Note that the first 3 decimals coincide. The cubic root of 1994277469 is about 1258.7182457728.

The spelling of 1994277469 in words is "one billion, nine hundred ninety-four million, two hundred seventy-seven thousand, four hundred sixty-nine".