161541253 has 4 divisors (see below), whose sum is σ = 161719488. Its totient is φ = 161363020.

The previous prime is 161541241. The next prime is 161541257. The reversal of 161541253 is 352145161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161541253 - 2⁹ = 161540741 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 (161541257) 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, 87751 + ... + 89572.

It is an arithmetic number, because the mean of its divisors is an integer number (40429872).

Almost surely, 2^161541253 is an apocalyptic number.

It is an amenable number.

161541253 is a deficient number, since it is larger than the sum of its proper divisors (178235).

161541253 is an equidigital number, since it uses as much as digits as its factorization.

161541253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178234.

The product of its digits is 3600, while the sum is 28.

The square root of 161541253 is about 12709.8880010801. Note that the first 3 decimals coincide. The cubic root of 161541253 is about 544.6211243222.

The spelling of 161541253 in words is "one hundred sixty-one million, five hundred forty-one thousand, two hundred fifty-three".