1897227469 has 2 divisors, whose sum is σ = 1897227470. Its totient is φ = 1897227468.

The previous prime is 1897227461. The next prime is 1897227533. The reversal of 1897227469 is 9647227981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1156680100 + 740547369 = 34010^2 + 27213^2 .

It is an emirp because it is prime and its reverse (9647227981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1897227469 - 2³ = 1897227461 is a prime.

It is a super-2 number, since 2×1897227469² = 7198944138256291922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1897227461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948613734 + 948613735.

It is an arithmetic number, because the mean of its divisors is an integer number (948613735).

Almost surely, 2^1897227469 is an apocalyptic number.

It is an amenable number.

1897227469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897227469 is an equidigital number, since it uses as much as digits as its factorization.

1897227469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 1897227469 is about 43557.1747132433. The cubic root of 1897227469 is about 1237.9595885574.

The spelling of 1897227469 in words is "one billion, eight hundred ninety-seven million, two hundred twenty-seven thousand, four hundred sixty-nine".