161224453 has 8 divisors (see below), whose sum is σ = 173763800. Its totient is φ = 148704768.

The previous prime is 161224433. The next prime is 161224487. The reversal of 161224453 is 354422161.

It can be written as a sum of positive squares in 4 ways, for example, as 4524129 + 156700324 = 2127^2 + 12518^2 .

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 161224453 - 2⁹ = 161223941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161224433) 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, 15193 + ... + 23521.

It is an arithmetic number, because the mean of its divisors is an integer number (21720475).

Almost surely, 2^161224453 is an apocalyptic number.

161224453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161224453 is a deficient number, since it is larger than the sum of its proper divisors (12539347).

161224453 is a wasteful number, since it uses less digits than its factorization.

161224453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9831.

The product of its digits is 5760, while the sum is 28.

The square root of 161224453 is about 12697.4191472126. The cubic root of 161224453 is about 544.2648708796.

The spelling of 161224453 in words is "one hundred sixty-one million, two hundred twenty-four thousand, four hundred fifty-three".