611201561 has 8 divisors (see below), whose sum is σ = 650898504. Its totient is φ = 571920640.

The previous prime is 611201533. The next prime is 611201567. The reversal of 611201561 is 165102116.

It can be written as a sum of positive squares in 4 ways, for example, as 137921536 + 473280025 = 11744^2 + 21755^2 .

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 611201561 - 2¹⁰ = 611200537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611201567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100970 + ... + 106851.

It is an arithmetic number, because the mean of its divisors is an integer number (81362313).

Almost surely, 2^611201561 is an apocalyptic number.

It is an amenable number.

611201561 is a deficient number, since it is larger than the sum of its proper divisors (39696943).

611201561 is a wasteful number, since it uses less digits than its factorization.

611201561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208011.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 611201561 is about 24722.4909950434. The cubic root of 611201561 is about 848.6490933545.

Adding to 611201561 its reverse (165102116), we get a palindrome (776303677).

The spelling of 611201561 in words is "six hundred eleven million, two hundred one thousand, five hundred sixty-one".