1561365935 has 16 divisors (see below), whose sum is σ = 2002405536. Its totient is φ = 1164622848.

The previous prime is 1561365929. The next prime is 1561365941. The reversal of 1561365935 is 5395631651.

It is an interprime number because it is at equal distance from previous prime (1561365929) and next prime (1561365941).

It is a cyclic number.

It is not a de Polignac number, because 1561365935 - 2⁴ = 1561365919 is a prime.

It is a Duffinian number.

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, 76742 + ... + 94931.

It is an arithmetic number, because the mean of its divisors is an integer number (125150346).

Almost surely, 2^1561365935 is an apocalyptic number.

1561365935 is a deficient number, since it is larger than the sum of its proper divisors (441039601).

1561365935 is a wasteful number, since it uses less digits than its factorization.

1561365935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171802.

The product of its digits is 364500, while the sum is 44.

The square root of 1561365935 is about 39514.1232346107. The cubic root of 1561365935 is about 1160.1164010719.

The spelling of 1561365935 in words is "one billion, five hundred sixty-one million, three hundred sixty-five thousand, nine hundred thirty-five".