1049555561 has 4 divisors (see below), whose sum is σ = 1083412224. Its totient is φ = 1015698900.

The previous prime is 1049555557. The next prime is 1049555599. The reversal of 1049555561 is 1655559401.

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 1049555561 - 2² = 1049555557 is a prime.

It is a super-2 number, since 2×1049555561² = 2203133751252049442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1049555531) 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, 16928285 + ... + 16928346.

It is an arithmetic number, because the mean of its divisors is an integer number (270853056).

Almost surely, 2^1049555561 is an apocalyptic number.

It is an amenable number.

1049555561 is a deficient number, since it is larger than the sum of its proper divisors (33856663).

1049555561 is an equidigital number, since it uses as much as digits as its factorization.

1049555561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33856662.

The product of its (nonzero) digits is 135000, while the sum is 41.

The square root of 1049555561 is about 32396.8449235416. The cubic root of 1049555561 is about 1016.2529314402.

The spelling of 1049555561 in words is "one billion, forty-nine million, five hundred fifty-five thousand, five hundred sixty-one".