161854601 has 2 divisors, whose sum is σ = 161854602. Its totient is φ = 161854600.

The previous prime is 161854549. The next prime is 161854607. The reversal of 161854601 is 106458161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114918400 + 46936201 = 10720^2 + 6851^2 .

It is an emirp because it is prime and its reverse (106458161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161854601 - 2¹⁴ = 161838217 is a prime.

It is not a weakly prime, because it can be changed into another prime (161854607) 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, 80927300 + 80927301.

It is an arithmetic number, because the mean of its divisors is an integer number (80927301).

Almost surely, 2^161854601 is an apocalyptic number.

It is an amenable number.

161854601 is a deficient number, since it is larger than the sum of its proper divisors (1).

161854601 is an equidigital number, since it uses as much as digits as its factorization.

161854601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 161854601 is about 12722.2089669994. The cubic root of 161854601 is about 544.9730379726.

The spelling of 161854601 in words is "one hundred sixty-one million, eight hundred fifty-four thousand, six hundred one".