1611551161 has 8 divisors (see below), whose sum is σ = 1761276384. Its totient is φ = 1462362720.

The previous prime is 1611551147. The next prime is 1611551197.

1611551161 is nontrivially palindromic in base 10.

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 1611551161 - 2⁵ = 1611551129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611557161) 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, 127900 + ... + 139933.

It is an arithmetic number, because the mean of its divisors is an integer number (220159548).

Almost surely, 2^1611551161 is an apocalyptic number.

1611551161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1611551161 is a deficient number, since it is larger than the sum of its proper divisors (149725223).

1611551161 is a wasteful number, since it uses less digits than its factorization.

1611551161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268391.

The product of its digits is 900, while the sum is 28.

The square root of 1611551161 is about 40144.1298448478. The cubic root of 1611551161 is about 1172.4149988616.

It can be divided in two parts, 16115 and 51161, that added together give a palindrome (67276).

The spelling of 1611551161 in words is "one billion, six hundred eleven million, five hundred fifty-one thousand, one hundred sixty-one".