1561069 has 2 divisors, whose sum is σ = 1561070. Its totient is φ = 1561068.

The previous prime is 1561039. The next prime is 1561111. The reversal of 1561069 is 9601651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1408969 + 152100 = 1187^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561069 - 2⁵ = 1561037 is a prime.

It is a super-2 number, since 2×1561069² = 4873872845522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780534 + 780535.

It is an arithmetic number, because the mean of its divisors is an integer number (780535).

2^1561069 is an apocalyptic number.

It is an amenable number.

1561069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561069 is an equidigital number, since it uses as much as digits as its factorization.

1561069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1561069 is about 1249.4274688832. The cubic root of 1561069 is about 116.0042854144.

It can be divided in two parts, 156 and 1069, that added together give a triangular number (1225 = T₄₉).

The spelling of 1561069 in words is "one million, five hundred sixty-one thousand, sixty-nine".