161951633 has 2 divisors, whose sum is σ = 161951634. Its totient is φ = 161951632.

The previous prime is 161951617. The next prime is 161951693. The reversal of 161951633 is 336159161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160985344 + 966289 = 12688^2 + 983^2 .

It is a cyclic number.

It is not a de Polignac number, because 161951633 - 2⁴ = 161951617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161951593 and 161951602.

It is not a weakly prime, because it can be changed into another prime (161951693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80975816 + 80975817.

It is an arithmetic number, because the mean of its divisors is an integer number (80975817).

Almost surely, 2^161951633 is an apocalyptic number.

It is an amenable number.

161951633 is a deficient number, since it is larger than the sum of its proper divisors (1).

161951633 is an equidigital number, since it uses as much as digits as its factorization.

161951633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 161951633 is about 12726.0218843125. The cubic root of 161951633 is about 545.0819201830.

The spelling of 161951633 in words is "one hundred sixty-one million, nine hundred fifty-one thousand, six hundred thirty-three".