161370403 has 2 divisors, whose sum is σ = 161370404. Its totient is φ = 161370402.

The previous prime is 161370389. The next prime is 161370457. The reversal of 161370403 is 304073161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161370403 - 2¹³ = 161362211 is a prime.

It is not a weakly prime, because it can be changed into another prime (161370463) 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, 80685201 + 80685202.

It is an arithmetic number, because the mean of its divisors is an integer number (80685202).

Almost surely, 2^161370403 is an apocalyptic number.

161370403 is a deficient number, since it is larger than the sum of its proper divisors (1).

161370403 is an equidigital number, since it uses as much as digits as its factorization.

161370403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 161370403 is about 12703.1650780426. The cubic root of 161370403 is about 544.4290550311.

The spelling of 161370403 in words is "one hundred sixty-one million, three hundred seventy thousand, four hundred three".