1561380441 has 8 divisors (see below), whose sum is σ = 2148996864. Its totient is φ = 1007342160.

The previous prime is 1561380421. The next prime is 1561380449. The reversal of 1561380441 is 1440831651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561380441 - 2¹¹ = 1561378393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561380449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8394426 + ... + 8394611.

It is an arithmetic number, because the mean of its divisors is an integer number (268624608).

Almost surely, 2^1561380441 is an apocalyptic number.

It is an amenable number.

1561380441 is a deficient number, since it is larger than the sum of its proper divisors (587616423).

1561380441 is a wasteful number, since it uses less digits than its factorization.

1561380441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16789071.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1561380441 is about 39514.3067888075. The cubic root of 1561380441 is about 1160.1199937801.

The spelling of 1561380441 in words is "one billion, five hundred sixty-one million, three hundred eighty thousand, four hundred forty-one".