161541437 has 2 divisors, whose sum is σ = 161541438. Its totient is φ = 161541436.

The previous prime is 161541433. The next prime is 161541449. The reversal of 161541437 is 734145161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160934596 + 606841 = 12686^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 161541437 - 2² = 161541433 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161541433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80770718 + 80770719.

It is an arithmetic number, because the mean of its divisors is an integer number (80770719).

Almost surely, 2^161541437 is an apocalyptic number.

It is an amenable number.

161541437 is a deficient number, since it is larger than the sum of its proper divisors (1).

161541437 is an equidigital number, since it uses as much as digits as its factorization.

161541437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 161541437 is about 12709.8952395368. The cubic root of 161541437 is about 544.6213311017.

Adding to 161541437 its reverse (734145161), we get a palindrome (895686598).

The spelling of 161541437 in words is "one hundred sixty-one million, five hundred forty-one thousand, four hundred thirty-seven".