611001001 has 4 divisors (see below), whose sum is σ = 658001092. Its totient is φ = 564000912.

The previous prime is 611000989. The next prime is 611001011. The reversal of 611001001 is 100100116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73874025 + 537126976 = 8595^2 + 23176^2 .

It is a cyclic number.

It is not a de Polignac number, because 611001001 - 2⁵ = 611000969 is a prime.

It is a Duffinian number.

611001001 is a modest number, since divided by 1001 gives 611 as remainder.

It is not an unprimeable number, because it can be changed into a prime (611001011) 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 3 ways as a sum of consecutive naturals, for example, 23500026 + ... + 23500051.

It is an arithmetic number, because the mean of its divisors is an integer number (164500273).

Almost surely, 2^611001001 is an apocalyptic number.

It is an amenable number.

611001001 is a deficient number, since it is larger than the sum of its proper divisors (47000091).

611001001 is a wasteful number, since it uses less digits than its factorization.

611001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47000090.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 611001001 is about 24718.4344366709. The cubic root of 611001001 is about 848.5562578136.

Adding to 611001001 its reverse (100100116), we get a palindrome (711101117).

The spelling of 611001001 in words is "six hundred eleven million, one thousand, one".