161252211 has 4 divisors (see below), whose sum is σ = 215002952. Its totient is φ = 107501472.

The previous prime is 161252207. The next prime is 161252213. The reversal of 161252211 is 112252161.

161252211 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.

It is not a de Polignac number, because 161252211 - 2² = 161252207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161252213) 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, 26875366 + ... + 26875371.

It is an arithmetic number, because the mean of its divisors is an integer number (53750738).

Almost surely, 2^161252211 is an apocalyptic number.

161252211 is a deficient number, since it is larger than the sum of its proper divisors (53750741).

161252211 is an equidigital number, since it uses as much as digits as its factorization.

161252211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53750740.

The product of its digits is 240, while the sum is 21.

The square root of 161252211 is about 12698.5121569419. The cubic root of 161252211 is about 544.2961044323.

Subtracting from 161252211 its reverse (112252161), we obtain a triangular number (49000050 = T₉₈₉₉).

It can be divided in two parts, 16125 and 2211, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 161252211 in words is "one hundred sixty-one million, two hundred fifty-two thousand, two hundred eleven".