161725471 has 16 divisors (see below), whose sum is σ = 175550976. Its totient is φ = 148427136.

The previous prime is 161725463. The next prime is 161725517. The reversal of 161725471 is 174527161.

It is not a de Polignac number, because 161725471 - 2³ = 161725463 is a prime.

It is a super-3 number, since 3×161725471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161726471) 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, 121210 + ... + 122536.

It is an arithmetic number, because the mean of its divisors is an integer number (10971936).

Almost surely, 2^161725471 is an apocalyptic number.

161725471 is a deficient number, since it is larger than the sum of its proper divisors (13825505).

161725471 is a wasteful number, since it uses less digits than its factorization.

161725471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518.

The product of its digits is 11760, while the sum is 34.

The square root of 161725471 is about 12717.1329709176. The cubic root of 161725471 is about 544.8280702239.

The spelling of 161725471 in words is "one hundred sixty-one million, seven hundred twenty-five thousand, four hundred seventy-one".