161628737 has 2 divisors, whose sum is σ = 161628738. Its totient is φ = 161628736.

The previous prime is 161628721. The next prime is 161628749. The reversal of 161628737 is 737826161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132802576 + 28826161 = 11524^2 + 5369^2 .

It is an emirp because it is prime and its reverse (737826161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161628737 - 2⁴ = 161628721 is a prime.

It is a super-2 number, since 2×161628737² = 52247697248430338, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161628694 and 161628703.

It is not a weakly prime, because it can be changed into another prime (161628037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80814368 + 80814369.

It is an arithmetic number, because the mean of its divisors is an integer number (80814369).

Almost surely, 2^161628737 is an apocalyptic number.

It is an amenable number.

161628737 is a deficient number, since it is larger than the sum of its proper divisors (1).

161628737 is an equidigital number, since it uses as much as digits as its factorization.

161628737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 161628737 is about 12713.3291076728. The cubic root of 161628737 is about 544.7194212694.

The spelling of 161628737 in words is "one hundred sixty-one million, six hundred twenty-eight thousand, seven hundred thirty-seven".