161254541 has 18 divisors (see below), whose sum is σ = 196123662. Its totient is φ = 132187440.

The previous prime is 161254523. The next prime is 161254553. The reversal of 161254541 is 145452161.

It can be written as a sum of positive squares in only one way, i.e., 96452041 + 64802500 = 9821^2 + 8050^2 .

It is not a de Polignac number, because 161254541 - 2²² = 157060237 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161253541) 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 17 ways as a sum of consecutive naturals, for example, 22811 + ... + 29031.

It is an arithmetic number, because the mean of its divisors is an integer number (10895759).

Almost surely, 2^161254541 is an apocalyptic number.

It is an amenable number.

161254541 is a deficient number, since it is larger than the sum of its proper divisors (34869121).

161254541 is an equidigital number, since it uses as much as digits as its factorization.

161254541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6281 (or 6251 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 161254541 is about 12698.6038996419. The cubic root of 161254541 is about 544.2987260063.

The spelling of 161254541 in words is "one hundred sixty-one million, two hundred fifty-four thousand, five hundred forty-one".