1561340135 has 16 divisors (see below), whose sum is σ = 1940444640. Its totient is φ = 1204613760.

The previous prime is 1561340107. The next prime is 1561340173. The reversal of 1561340135 is 5310431651.

It is a de Polignac number, because none of the positive numbers 2^k-1561340135 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 1561340098 and 1561340107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130724 + ... + 142166.

It is an arithmetic number, because the mean of its divisors is an integer number (121277790).

Almost surely, 2^1561340135 is an apocalyptic number.

1561340135 is a deficient number, since it is larger than the sum of its proper divisors (379104505).

1561340135 is a wasteful number, since it uses less digits than its factorization.

1561340135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12418.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1561340135 is about 39513.7967677114. The cubic root of 1561340135 is about 1160.1100111183.

Adding to 1561340135 its reverse (5310431651), we get a palindrome (6871771786).

The spelling of 1561340135 in words is "one billion, five hundred sixty-one million, three hundred forty thousand, one hundred thirty-five".