1561707141 has 4 divisors (see below), whose sum is σ = 2082276192. Its totient is φ = 1041138092.

The previous prime is 1561707089. The next prime is 1561707151. The reversal of 1561707141 is 1417071651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1417071651 = 3 ⋅472357217.

It is a cyclic number.

It is not a de Polignac number, because 1561707141 - 2¹⁰ = 1561706117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561707151) 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, 260284521 + ... + 260284526.

It is an arithmetic number, because the mean of its divisors is an integer number (520569048).

Almost surely, 2^1561707141 is an apocalyptic number.

It is an amenable number.

1561707141 is a deficient number, since it is larger than the sum of its proper divisors (520569051).

1561707141 is an equidigital number, since it uses as much as digits as its factorization.

1561707141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520569050.

The product of its (nonzero) digits is 5880, while the sum is 33.

The square root of 1561707141 is about 39518.4405183201. The cubic root of 1561707141 is about 1160.2009018365.

Adding to 1561707141 its reverse (1417071651), we get a palindrome (2978778792).

The spelling of 1561707141 in words is "one billion, five hundred sixty-one million, seven hundred seven thousand, one hundred forty-one".