1561379567 has 8 divisors (see below), whose sum is σ = 1703844480. Its totient is φ = 1419001560.

The previous prime is 1561379563. The next prime is 1561379581. The reversal of 1561379567 is 7659731651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561379567 - 2² = 1561379563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561379563) 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, 19208 + ... + 59090.

It is an arithmetic number, because the mean of its divisors is an integer number (212980560).

Almost surely, 2^1561379567 is an apocalyptic number.

1561379567 is a deficient number, since it is larger than the sum of its proper divisors (142464913).

1561379567 is a wasteful number, since it uses less digits than its factorization.

1561379567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43453.

The product of its digits is 1190700, while the sum is 50.

The square root of 1561379567 is about 39514.2957295205. The cubic root of 1561379567 is about 1160.1197773167.

The spelling of 1561379567 in words is "one billion, five hundred sixty-one million, three hundred seventy-nine thousand, five hundred sixty-seven".