1205561145 has 8 divisors (see below), whose sum is σ = 1928897856. Its totient is φ = 642965936.

The previous prime is 1205561141. The next prime is 1205561173. The reversal of 1205561145 is 5411655021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205561145 - 2² = 1205561141 is a prime.

It is a super-2 number, since 2×1205561145² = 2906755348667422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1205561141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40185357 + ... + 40185386.

It is an arithmetic number, because the mean of its divisors is an integer number (241112232).

Almost surely, 2^1205561145 is an apocalyptic number.

1205561145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205561145 is a deficient number, since it is larger than the sum of its proper divisors (723336711).

1205561145 is an equidigital number, since it uses as much as digits as its factorization.

1205561145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80370751.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1205561145 is about 34721.1915838152. The cubic root of 1205561145 is about 1064.2975949864.

The spelling of 1205561145 in words is "one billion, two hundred five million, five hundred sixty-one thousand, one hundred forty-five".