161400403 has 2 divisors, whose sum is σ = 161400404. Its totient is φ = 161400402.

The previous prime is 161400391. The next prime is 161400409. The reversal of 161400403 is 304004161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161400403 - 2¹³ = 161392211 is a prime.

It is not a weakly prime, because it can be changed into another prime (161400409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80700201 + 80700202.

It is an arithmetic number, because the mean of its divisors is an integer number (80700202).

Almost surely, 2^161400403 is an apocalyptic number.

161400403 is a deficient number, since it is larger than the sum of its proper divisors (1).

161400403 is an equidigital number, since it uses as much as digits as its factorization.

161400403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 161400403 is about 12704.3458312500. The cubic root of 161400403 is about 544.4627907912.

Adding to 161400403 its reverse (304004161), we get a palindrome (465404564).

The spelling of 161400403 in words is "one hundred sixty-one million, four hundred thousand, four hundred three".