1561313541 has 12 divisors (see below), whose sum is σ = 2211411872. Its totient is φ = 979647168.

The previous prime is 1561313477. The next prime is 1561313549. The reversal of 1561313541 is 1453131651.

It is not a de Polignac number, because 1561313541 - 2⁶ = 1561313477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1561313499 and 1561313508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561313549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 899545 + ... + 901278.

Almost surely, 2^1561313541 is an apocalyptic number.

It is an amenable number.

1561313541 is a deficient number, since it is larger than the sum of its proper divisors (650098331).

1561313541 is a wasteful number, since it uses less digits than its factorization.

1561313541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800860 (or 1800843 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 1561313541 is about 39513.4602509069. The cubic root of 1561313541 is about 1160.1034244388.

The spelling of 1561313541 in words is "one billion, five hundred sixty-one million, three hundred thirteen thousand, five hundred forty-one".