161400037 has 2 divisors, whose sum is σ = 161400038. Its totient is φ = 161400036.

The previous prime is 161400017. The next prime is 161400077. The reversal of 161400037 is 730004161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95238081 + 66161956 = 9759^2 + 8134^2 .

It is a cyclic number.

It is not a de Polignac number, because 161400037 - 2¹⁹ = 160875749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161399990 and 161400017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161400017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80700018 + 80700019.

It is an arithmetic number, because the mean of its divisors is an integer number (80700019).

Almost surely, 2^161400037 is an apocalyptic number.

It is an amenable number.

161400037 is a deficient number, since it is larger than the sum of its proper divisors (1).

161400037 is an equidigital number, since it uses as much as digits as its factorization.

161400037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 161400037 is about 12704.3314267221. The cubic root of 161400037 is about 544.4623792401.

Adding to 161400037 its reverse (730004161), we get a palindrome (891404198).

The spelling of 161400037 in words is "one hundred sixty-one million, four hundred thousand, thirty-seven".