1055661559 has 4 divisors (see below), whose sum is σ = 1059100504. Its totient is φ = 1052222616.

The previous prime is 1055661539. The next prime is 1055661577. The reversal of 1055661559 is 9551665501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1055661559 - 2¹⁹ = 1055137271 is a prime.

It is a super-2 number, since 2×1055661559² = 2228842654300620962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055661539) 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, 1719012 + ... + 1719625.

It is an arithmetic number, because the mean of its divisors is an integer number (264775126).

Almost surely, 2^1055661559 is an apocalyptic number.

1055661559 is a deficient number, since it is larger than the sum of its proper divisors (3438945).

1055661559 is an equidigital number, since it uses as much as digits as its factorization.

1055661559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438944.

The product of its (nonzero) digits is 202500, while the sum is 43.

The square root of 1055661559 is about 32490.9458003303. The cubic root of 1055661559 is about 1018.2198731112.

The spelling of 1055661559 in words is "one billion, fifty-five million, six hundred sixty-one thousand, five hundred fifty-nine".