1561360245 has 16 divisors (see below), whose sum is σ = 2629659840. Its totient is φ = 788897664.

The previous prime is 1561360217. The next prime is 1561360277. The reversal of 1561360245 is 5420631651.

It is not a de Polignac number, because 1561360245 - 2¹² = 1561356149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2738944 + ... + 2739513.

It is an arithmetic number, because the mean of its divisors is an integer number (164353740).

Almost surely, 2^1561360245 is an apocalyptic number.

1561360245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561360245 is a deficient number, since it is larger than the sum of its proper divisors (1068299595).

1561360245 is a wasteful number, since it uses less digits than its factorization.

1561360245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5478484.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1561360245 is about 39514.0512349721. The cubic root of 1561360245 is about 1160.1149918208.

Adding to 1561360245 its reverse (5420631651), we get a palindrome (6981991896).

The spelling of 1561360245 in words is "one billion, five hundred sixty-one million, three hundred sixty thousand, two hundred forty-five".