161651353 has 4 divisors (see below), whose sum is σ = 161676900. Its totient is φ = 161625808.

The previous prime is 161651339. The next prime is 161651387. The reversal of 161651353 is 353156161.

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: 353156161 = 2621 ⋅134741.

It can be written as a sum of positive squares in 2 ways, for example, as 125507209 + 36144144 = 11203^2 + 6012^2 .

It is a cyclic number.

It is not a de Polignac number, because 161651353 - 2¹³ = 161643161 is a prime.

It is a super-2 number, since 2×161651353² = 52262319853461218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161651053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4551 + ... + 18547.

It is an arithmetic number, because the mean of its divisors is an integer number (40419225).

Almost surely, 2^161651353 is an apocalyptic number.

It is an amenable number.

161651353 is a deficient number, since it is larger than the sum of its proper divisors (25547).

161651353 is a wasteful number, since it uses less digits than its factorization.

161651353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25546.

The product of its digits is 8100, while the sum is 31.

The square root of 161651353 is about 12714.2185367407. The cubic root of 161651353 is about 544.7448268174.

The spelling of 161651353 in words is "one hundred sixty-one million, six hundred fifty-one thousand, three hundred fifty-three".