1041145561 has 4 divisors (see below), whose sum is σ = 1041300432. Its totient is φ = 1040990692.

The previous prime is 1041145549. The next prime is 1041145579. The reversal of 1041145561 is 1655411401.

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 1041145561 - 2¹⁷ = 1041014489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1041145961) 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, 66871 + ... + 80956.

It is an arithmetic number, because the mean of its divisors is an integer number (260325108).

Almost surely, 2^1041145561 is an apocalyptic number.

It is an amenable number.

1041145561 is a deficient number, since it is larger than the sum of its proper divisors (154871).

1041145561 is an equidigital number, since it uses as much as digits as its factorization.

1041145561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154870.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1041145561 is about 32266.7872742236. The cubic root of 1041145561 is about 1013.5312660039.

Adding to 1041145561 its reverse (1655411401), we get a palindrome (2696556962).

The spelling of 1041145561 in words is "one billion, forty-one million, one hundred forty-five thousand, five hundred sixty-one".