1205056553 has 16 divisors (see below), whose sum is σ = 1250859456. Its totient is φ = 1160174400.

The previous prime is 1205056493. The next prime is 1205056603. The reversal of 1205056553 is 3556505021.

It is not a de Polignac number, because 1205056553 - 2²⁶ = 1137947689 is a prime.

It is a super-2 number, since 2×1205056553² = 2904322591856483618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205056253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1272026 + ... + 1272972.

It is an arithmetic number, because the mean of its divisors is an integer number (78178716).

Almost surely, 2^1205056553 is an apocalyptic number.

It is an amenable number.

1205056553 is a deficient number, since it is larger than the sum of its proper divisors (45802903).

1205056553 is a wasteful number, since it uses less digits than its factorization.

1205056553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 1205056553 is about 34713.9244828354. The cubic root of 1205056553 is about 1064.1490857223.

The spelling of 1205056553 in words is "one billion, two hundred five million, fifty-six thousand, five hundred fifty-three".