161225371 has 4 divisors (see below), whose sum is σ = 161251200. Its totient is φ = 161199544.

The previous prime is 161225303. The next prime is 161225381. The reversal of 161225371 is 173522161.

It is a happy number.

161225371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 173522161 = 67 ⋅2589883.

It is a cyclic number.

It is not a de Polignac number, because 161225371 - 2¹¹ = 161223323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161225381) 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, 2925 + ... + 18193.

It is an arithmetic number, because the mean of its divisors is an integer number (40312800).

Almost surely, 2^161225371 is an apocalyptic number.

161225371 is a deficient number, since it is larger than the sum of its proper divisors (25829).

161225371 is a wasteful number, since it uses less digits than its factorization.

161225371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25828.

The product of its digits is 2520, while the sum is 28.

The square root of 161225371 is about 12697.4552962395. The cubic root of 161225371 is about 544.2659038788.

It can be divided in two parts, 161225 and 371, that added together give a triangular number (161596 = T₅₆₈).

The spelling of 161225371 in words is "one hundred sixty-one million, two hundred twenty-five thousand, three hundred seventy-one".