1611634001 has 4 divisors (see below), whose sum is σ = 1621284672. Its totient is φ = 1601983332.

The previous prime is 1611633973. The next prime is 1611634039. The reversal of 1611634001 is 1004361161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1004361161 = 5821 ⋅172541.

It is a cyclic number.

It is not a de Polignac number, because 1611634001 - 2²⁶ = 1544525137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611634201) 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, 4825085 + ... + 4825418.

It is an arithmetic number, because the mean of its divisors is an integer number (405321168).

Almost surely, 2^1611634001 is an apocalyptic number.

It is an amenable number.

1611634001 is a deficient number, since it is larger than the sum of its proper divisors (9650671).

1611634001 is an equidigital number, since it uses as much as digits as its factorization.

1611634001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9650670.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1611634001 is about 40145.1616138234. The cubic root of 1611634001 is about 1172.4350874149.

Adding to 1611634001 its reverse (1004361161), we get a palindrome (2615995162).

The spelling of 1611634001 in words is "one billion, six hundred eleven million, six hundred thirty-four thousand, one".