161020037 has 2 divisors, whose sum is σ = 161020038. Its totient is φ = 161020036.

The previous prime is 161020021. The next prime is 161020043. The reversal of 161020037 is 730020161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88190881 + 72829156 = 9391^2 + 8534^2 .

It is a cyclic number.

It is not a de Polignac number, because 161020037 - 2⁴ = 161020021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161020537) 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 as a sum of consecutive naturals, namely, 80510018 + 80510019.

It is an arithmetic number, because the mean of its divisors is an integer number (80510019).

Almost surely, 2^161020037 is an apocalyptic number.

It is an amenable number.

161020037 is a deficient number, since it is larger than the sum of its proper divisors (1).

161020037 is an equidigital number, since it uses as much as digits as its factorization.

161020037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 161020037 is about 12689.3670842954. The cubic root of 161020037 is about 544.0347496635.

Adding to 161020037 its reverse (730020161), we get a palindrome (891040198).

The spelling of 161020037 in words is "one hundred sixty-one million, twenty thousand, thirty-seven".