11561462461 has 4 divisors (see below), whose sum is σ = 11807451072. Its totient is φ = 11315473852.

The previous prime is 11561462443. The next prime is 11561462491. The reversal of 11561462461 is 16426416511.

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 11561462461 - 2²⁷ = 11427244733 is a prime.

It is a super-2 number, since 2×11561462461² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11561462461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561462441) 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, 122994235 + ... + 122994328.

It is an arithmetic number, because the mean of its divisors is an integer number (2951862768).

Almost surely, 2^11561462461 is an apocalyptic number.

It is an amenable number.

11561462461 is a deficient number, since it is larger than the sum of its proper divisors (245988611).

11561462461 is an equidigital number, since it uses as much as digits as its factorization.

11561462461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245988610.

The product of its digits is 34560, while the sum is 37.

Adding to 11561462461 its reverse (16426416511), we get a palindrome (27987878972).

The spelling of 11561462461 in words is "eleven billion, five hundred sixty-one million, four hundred sixty-two thousand, four hundred sixty-one".