1561417159 has 4 divisors (see below), whose sum is σ = 1615259160. Its totient is φ = 1507575160.

The previous prime is 1561417133. The next prime is 1561417171. The reversal of 1561417159 is 9517141651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9517141651 = 3181 ⋅2991871.

It is a cyclic number.

It is not a de Polignac number, because 1561417159 - 2²⁵ = 1527862727 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 (1561417129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26920957 + ... + 26921014.

It is an arithmetic number, because the mean of its divisors is an integer number (403814790).

Almost surely, 2^1561417159 is an apocalyptic number.

1561417159 is a deficient number, since it is larger than the sum of its proper divisors (53842001).

1561417159 is an equidigital number, since it uses as much as digits as its factorization.

1561417159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53842000.

The product of its digits is 37800, while the sum is 40.

The square root of 1561417159 is about 39514.7714026034. The cubic root of 1561417159 is about 1160.1290876458.

The spelling of 1561417159 in words is "one billion, five hundred sixty-one million, four hundred seventeen thousand, one hundred fifty-nine".