161451803 has 2 divisors, whose sum is σ = 161451804. Its totient is φ = 161451802.

The previous prime is 161451791. The next prime is 161451817. The reversal of 161451803 is 308154161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161451803 - 2⁶ = 161451739 is a prime.

It is not a weakly prime, because it can be changed into another prime (161451853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80725901 + 80725902.

It is an arithmetic number, because the mean of its divisors is an integer number (80725902).

Almost surely, 2^161451803 is an apocalyptic number.

161451803 is a deficient number, since it is larger than the sum of its proper divisors (1).

161451803 is an equidigital number, since it uses as much as digits as its factorization.

161451803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 161451803 is about 12706.3686000368. The cubic root of 161451803 is about 544.5205816779.

The spelling of 161451803 in words is "one hundred sixty-one million, four hundred fifty-one thousand, eight hundred three".