161585737 has 2 divisors, whose sum is σ = 161585738. Its totient is φ = 161585736.

The previous prime is 161585713. The next prime is 161585761. The reversal of 161585737 is 737585161.

It is a balanced prime because it is at equal distance from previous prime (161585713) and next prime (161585761).

It can be written as a sum of positive squares in only one way, i.e., 95179536 + 66406201 = 9756^2 + 8149^2 .

It is an emirp because it is prime and its reverse (737585161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161585737 - 2¹⁵ = 161552969 is a prime.

It is a super-2 number, since 2×161585737² = 52219900803666338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161585693 and 161585702.

It is not a weakly prime, because it can be changed into another prime (161585777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80792868 + 80792869.

It is an arithmetic number, because the mean of its divisors is an integer number (80792869).

Almost surely, 2^161585737 is an apocalyptic number.

It is an amenable number.

161585737 is a deficient number, since it is larger than the sum of its proper divisors (1).

161585737 is an equidigital number, since it uses as much as digits as its factorization.

161585737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 43.

The square root of 161585737 is about 12711.6378567044. The cubic root of 161585737 is about 544.6711109400.

The spelling of 161585737 in words is "one hundred sixty-one million, five hundred eighty-five thousand, seven hundred thirty-seven".