1611061651 has 4 divisors (see below), whose sum is σ = 1627670632. Its totient is φ = 1594452672.

The previous prime is 1611061637. The next prime is 1611061681. The reversal of 1611061651 is 1561601161.

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

It is a cyclic number.

It is not a de Polignac number, because 1611061651 - 2⁷ = 1611061523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611061631) 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, 8304345 + ... + 8304538.

It is an arithmetic number, because the mean of its divisors is an integer number (406917658).

Almost surely, 2^1611061651 is an apocalyptic number.

1611061651 is a deficient number, since it is larger than the sum of its proper divisors (16608981).

1611061651 is an equidigital number, since it uses as much as digits as its factorization.

1611061651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16608980.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1611061651 is about 40138.0324754465. The cubic root of 1611061651 is about 1172.2962794980.

The spelling of 1611061651 in words is "one billion, six hundred eleven million, sixty-one thousand, six hundred fifty-one".