161700437 has 2 divisors, whose sum is σ = 161700438. Its totient is φ = 161700436.

The previous prime is 161700389. The next prime is 161700463. The reversal of 161700437 is 734007161.

161700437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119268241 + 42432196 = 10921^2 + 6514^2 .

It is an emirp because it is prime and its reverse (734007161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161700437 - 2¹⁰ = 161699413 is a prime.

It is a super-2 number, since 2×161700437² = 52294062651981938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161700137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80850218 + 80850219.

It is an arithmetic number, because the mean of its divisors is an integer number (80850219).

Almost surely, 2^161700437 is an apocalyptic number.

It is an amenable number.

161700437 is a deficient number, since it is larger than the sum of its proper divisors (1).

161700437 is an equidigital number, since it uses as much as digits as its factorization.

161700437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 161700437 is about 12716.1486700966. The cubic root of 161700437 is about 544.7999568833.

Adding to 161700437 its reverse (734007161), we get a palindrome (895707598).

The spelling of 161700437 in words is "one hundred sixty-one million, seven hundred thousand, four hundred thirty-seven".