161003537 has 4 divisors (see below), whose sum is σ = 161812800. Its totient is φ = 160194276.

The previous prime is 161003527. The next prime is 161003543. The reversal of 161003537 is 735300161.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 735300161 = 61 ⋅12054101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161003537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161003527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404333 + ... + 404730.

It is an arithmetic number, because the mean of its divisors is an integer number (40453200).

Almost surely, 2^161003537 is an apocalyptic number.

It is an amenable number.

161003537 is a deficient number, since it is larger than the sum of its proper divisors (809263).

161003537 is an equidigital number, since it uses as much as digits as its factorization.

161003537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809262.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 161003537 is about 12688.7169170094. The cubic root of 161003537 is about 544.0161663034.

Adding to 161003537 its reverse (735300161), we get a palindrome (896303698).

The spelling of 161003537 in words is "one hundred sixty-one million, three thousand, five hundred thirty-seven".