1561333241 has 8 divisors (see below), whose sum is σ = 1693710984. Its totient is φ = 1430709120.

The previous prime is 1561333237. The next prime is 1561333253. The reversal of 1561333241 is 1423331651.

It can be written as a sum of positive squares in 4 ways, for example, as 10627600 + 1550705641 = 3260^2 + 39379^2 .

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 1561333241 - 2² = 1561333237 is a prime.

It is a super-2 number, since 2×1561333241² = 4875522978903128162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561333231) 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, 436550 + ... + 440111.

It is an arithmetic number, because the mean of its divisors is an integer number (211713873).

Almost surely, 2^1561333241 is an apocalyptic number.

It is an amenable number.

1561333241 is a deficient number, since it is larger than the sum of its proper divisors (132377743).

1561333241 is a wasteful number, since it uses less digits than its factorization.

1561333241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876811.

The product of its digits is 6480, while the sum is 29.

The square root of 1561333241 is about 39513.7095322623. The cubic root of 1561333241 is about 1160.1083036513.

Adding to 1561333241 its reverse (1423331651), we get a palindrome (2984664892).

The spelling of 1561333241 in words is "one billion, five hundred sixty-one million, three hundred thirty-three thousand, two hundred forty-one".