1561064341 has 4 divisors (see below), whose sum is σ = 1562119884. Its totient is φ = 1560008800.

The previous prime is 1561064327. The next prime is 1561064347. The reversal of 1561064341 is 1434601651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1019524900 + 541539441 = 31930^2 + 23271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561064341 - 2²⁷ = 1426846613 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561064347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525550 + ... + 528511.

It is an arithmetic number, because the mean of its divisors is an integer number (390529971).

Almost surely, 2^1561064341 is an apocalyptic number.

It is an amenable number.

1561064341 is a deficient number, since it is larger than the sum of its proper divisors (1055543).

1561064341 is a wasteful number, since it uses less digits than its factorization.

1561064341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055542.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1561064341 is about 39510.3067692469. The cubic root of 1561064341 is about 1160.0417000963.

Adding to 1561064341 its reverse (1434601651), we get a palindrome (2995665992).

The spelling of 1561064341 in words is "one billion, five hundred sixty-one million, sixty-four thousand, three hundred forty-one".