1241210561 has 4 divisors (see below), whose sum is σ = 1247448000. Its totient is φ = 1234973124.

The previous prime is 1241210557. The next prime is 1241210563. The reversal of 1241210561 is 1650121421.

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: 1650121421 = 13 ⋅126932417.

It is a cyclic number.

It is not a de Polignac number, because 1241210561 - 2² = 1241210557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1241210563) 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, 3118421 + ... + 3118818.

It is an arithmetic number, because the mean of its divisors is an integer number (311862000).

Almost surely, 2^1241210561 is an apocalyptic number.

It is an amenable number.

1241210561 is a deficient number, since it is larger than the sum of its proper divisors (6237439).

1241210561 is an equidigital number, since it uses as much as digits as its factorization.

1241210561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6237438.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1241210561 is about 35230.8183413329. The cubic root of 1241210561 is about 1074.6865676459.

Adding to 1241210561 its reverse (1650121421), we get a palindrome (2891331982).

The spelling of 1241210561 in words is "one billion, two hundred forty-one million, two hundred ten thousand, five hundred sixty-one".