1611562161 has 32 divisors (see below), whose sum is σ = 2449077120. Its totient is φ = 933632000.

The previous prime is 1611562157. The next prime is 1611562163. The reversal of 1611562161 is 1612651161.

It is a cyclic number.

It is not a de Polignac number, because 1611562161 - 2² = 1611562157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611562163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88321 + ... + 104993.

It is an arithmetic number, because the mean of its divisors is an integer number (76533660).

Almost surely, 2^1611562161 is an apocalyptic number.

1611562161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1611562161 is a deficient number, since it is larger than the sum of its proper divisors (837514959).

1611562161 is a wasteful number, since it uses less digits than its factorization.

1611562161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16817.

The product of its digits is 2160, while the sum is 30.

The square root of 1611562161 is about 40144.2668509465. The cubic root of 1611562161 is about 1172.4176663817.

The spelling of 1611562161 in words is "one billion, six hundred eleven million, five hundred sixty-two thousand, one hundred sixty-one".