1285561469 has 2 divisors, whose sum is σ = 1285561470. Its totient is φ = 1285561468.

The previous prime is 1285561457. The next prime is 1285561477. The reversal of 1285561469 is 9641655821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1099784569 + 185776900 = 33163^2 + 13630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285561469 - 2¹⁶ = 1285495933 is a prime.

It is a super-2 number, since 2×1285561469² = 3305336581154875922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285561439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642780734 + 642780735.

It is an arithmetic number, because the mean of its divisors is an integer number (642780735).

Almost surely, 2^1285561469 is an apocalyptic number.

It is an amenable number.

1285561469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285561469 is an equidigital number, since it uses as much as digits as its factorization.

1285561469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The square root of 1285561469 is about 35854.7272894384. The cubic root of 1285561469 is about 1087.3372902119.

The spelling of 1285561469 in words is "one billion, two hundred eighty-five million, five hundred sixty-one thousand, four hundred sixty-nine".