2145687161 has 8 divisors (see below), whose sum is σ = 2193143040. Its totient is φ = 2098601008.

The previous prime is 2145687149. The next prime is 2145687169. The reversal of 2145687161 is 1617865412.

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 2145687161 - 2²⁶ = 2078578297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145687169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80681 + ... + 103926.

It is an arithmetic number, because the mean of its divisors is an integer number (274142880).

Almost surely, 2^2145687161 is an apocalyptic number.

It is an amenable number.

2145687161 is a deficient number, since it is larger than the sum of its proper divisors (47455879).

2145687161 is a wasteful number, since it uses less digits than its factorization.

2145687161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184863.

The product of its digits is 80640, while the sum is 41.

The square root of 2145687161 is about 46321.5625923824. The cubic root of 2145687161 is about 1289.7992919316.

The spelling of 2145687161 in words is "two billion, one hundred forty-five million, six hundred eighty-seven thousand, one hundred sixty-one".