161712651 has 16 divisors (see below), whose sum is σ = 221760000. Its totient is φ = 104758080.

The previous prime is 161712643. The next prime is 161712673. The reversal of 161712651 is 156217161.

It is not a de Polignac number, because 161712651 - 2³ = 161712643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161712601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29850 + ... + 34848.

It is an arithmetic number, because the mean of its divisors is an integer number (13860000).

Almost surely, 2^161712651 is an apocalyptic number.

161712651 is a deficient number, since it is larger than the sum of its proper divisors (60047349).

161712651 is a wasteful number, since it uses less digits than its factorization.

161712651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5306.

The product of its digits is 2520, while the sum is 30.

The square root of 161712651 is about 12716.6289165014. The cubic root of 161712651 is about 544.8136736451.

The spelling of 161712651 in words is "one hundred sixty-one million, seven hundred twelve thousand, six hundred fifty-one".