161451471 has 4 divisors (see below), whose sum is σ = 215268632. Its totient is φ = 107634312.

The previous prime is 161451449. The next prime is 161451487. The reversal of 161451471 is 174154161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 174154161 = 3 ⋅58051387.

It is not a de Polignac number, because 161451471 - 2¹⁰ = 161450447 is a prime.

It is a super-3 number, since 3×161451471³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161451491) 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, 26908576 + ... + 26908581.

It is an arithmetic number, because the mean of its divisors is an integer number (53817158).

Almost surely, 2^161451471 is an apocalyptic number.

161451471 is a deficient number, since it is larger than the sum of its proper divisors (53817161).

161451471 is an equidigital number, since it uses as much as digits as its factorization.

161451471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53817160.

The product of its digits is 3360, while the sum is 30.

The square root of 161451471 is about 12706.3555357152. The cubic root of 161451471 is about 544.5202084376.

The spelling of 161451471 in words is "one hundred sixty-one million, four hundred fifty-one thousand, four hundred seventy-one".