1210240561 has 4 divisors (see below), whose sum is σ = 1210613824. Its totient is φ = 1209867300.

The previous prime is 1210240469. The next prime is 1210240567. The reversal of 1210240561 is 1650420121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1210240561 - 2⁷ = 1210240433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210240567) 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, 181725 + ... + 188266.

It is an arithmetic number, because the mean of its divisors is an integer number (302653456).

Almost surely, 2^1210240561 is an apocalyptic number.

It is an amenable number.

1210240561 is a deficient number, since it is larger than the sum of its proper divisors (373263).

1210240561 is an equidigital number, since it uses as much as digits as its factorization.

1210240561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373262.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1210240561 is about 34788.5119112617. The cubic root of 1210240561 is about 1065.6728498117.

Adding to 1210240561 its reverse (1650420121), we get a palindrome (2860660682).

The spelling of 1210240561 in words is "one billion, two hundred ten million, two hundred forty thousand, five hundred sixty-one".