161161651 has 4 divisors (see below), whose sum is σ = 184184752. Its totient is φ = 138138552.

The previous prime is 161161643. The next prime is 161161657. The reversal of 161161651 is 156161161.

161161651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161161651 - 2³ = 161161643 is a prime.

It is a super-3 number, since 3×161161651³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161161657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11511540 + ... + 11511553.

It is an arithmetic number, because the mean of its divisors is an integer number (46046188).

Almost surely, 2^161161651 is an apocalyptic number.

161161651 is a deficient number, since it is larger than the sum of its proper divisors (23023101).

161161651 is an equidigital number, since it uses as much as digits as its factorization.

161161651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23023100.

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

The square root of 161161651 is about 12694.9458840910. The cubic root of 161161651 is about 544.1941922678.

The spelling of 161161651 in words is "one hundred sixty-one million, one hundred sixty-one thousand, six hundred fifty-one".