1561197535 has 4 divisors (see below), whose sum is σ = 1873437048. Its totient is φ = 1248958024.

The previous prime is 1561197523. The next prime is 1561197551. The reversal of 1561197535 is 5357911651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561197535 - 2¹¹ = 1561195487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561197491 and 1561197500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156119749 + ... + 156119758.

It is an arithmetic number, because the mean of its divisors is an integer number (468359262).

Almost surely, 2^1561197535 is an apocalyptic number.

1561197535 is a deficient number, since it is larger than the sum of its proper divisors (312239513).

1561197535 is an equidigital number, since it uses as much as digits as its factorization.

1561197535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312239512.

The product of its digits is 141750, while the sum is 43.

The square root of 1561197535 is about 39511.9922934797. The cubic root of 1561197535 is about 1160.0746917324.

The spelling of 1561197535 in words is "one billion, five hundred sixty-one million, one hundred ninety-seven thousand, five hundred thirty-five".