1201012561 has 8 divisors (see below), whose sum is σ = 1379484800. Its totient is φ = 1024265088.

The previous prime is 1201012517. The next prime is 1201012577. The reversal of 1201012561 is 1652101021.

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

It is not a de Polignac number, because 1201012561 - 2⁷ = 1201012433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201012361) 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, 429696 + ... + 432481.

It is an arithmetic number, because the mean of its divisors is an integer number (172435600).

Almost surely, 2^1201012561 is an apocalyptic number.

It is an amenable number.

1201012561 is a deficient number, since it is larger than the sum of its proper divisors (178472239).

1201012561 is an equidigital number, since it uses as much as digits as its factorization.

1201012561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862383.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1201012561 is about 34655.6281287759. The cubic root of 1201012561 is about 1062.9573758827.

Adding to 1201012561 its reverse (1652101021), we get a palindrome (2853113582).

The spelling of 1201012561 in words is "one billion, two hundred one million, twelve thousand, five hundred sixty-one".