1561352101 has 2 divisors, whose sum is σ = 1561352102. Its totient is φ = 1561352100.

The previous prime is 1561352099. The next prime is 1561352167. The reversal of 1561352101 is 1012531651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144130625 + 417221476 = 33825^2 + 20426^2 .

It is an emirp because it is prime and its reverse (1012531651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1561352101 - 2¹ = 1561352099 is a prime.

It is a super-2 number, since 2×1561352101² = 4875640766594228402, which contains 22 as substring.

Together with 1561352099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561352701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780676050 + 780676051.

It is an arithmetic number, because the mean of its divisors is an integer number (780676051).

Almost surely, 2^1561352101 is an apocalyptic number.

It is an amenable number.

1561352101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561352101 is an equidigital number, since it uses as much as digits as its factorization.

1561352101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1561352101 is about 39513.9481828885. The cubic root of 1561352101 is about 1160.1129747776.

Adding to 1561352101 its reverse (1012531651), we get a palindrome (2573883752).

The spelling of 1561352101 in words is "one billion, five hundred sixty-one million, three hundred fifty-two thousand, one hundred one".