1994225869 has 2 divisors, whose sum is σ = 1994225870. Its totient is φ = 1994225868.

The previous prime is 1994225801. The next prime is 1994225887. The reversal of 1994225869 is 9685224991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1055600100 + 938625769 = 32490^2 + 30637^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994225869 - 2⁹ = 1994225357 is a prime.

It is a super-2 number, since 2×1994225869² = 7953873633177610322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994222869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997112934 + 997112935.

It is an arithmetic number, because the mean of its divisors is an integer number (997112935).

Almost surely, 2^1994225869 is an apocalyptic number.

It is an amenable number.

1994225869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994225869 is an equidigital number, since it uses as much as digits as its factorization.

1994225869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 1994225869 is about 44656.7561405886. The cubic root of 1994225869 is about 1258.7073896403.

The spelling of 1994225869 in words is "one billion, nine hundred ninety-four million, two hundred twenty-five thousand, eight hundred sixty-nine".