161055403 has 4 divisors (see below), whose sum is σ = 161080848. Its totient is φ = 161029960.

The previous prime is 161055383. The next prime is 161055409. The reversal of 161055403 is 304550161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161055403 - 2⁵ = 161055371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161055409) 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 in 3 ways as a sum of consecutive naturals, for example, 5025 + ... + 18637.

It is an arithmetic number, because the mean of its divisors is an integer number (40270212).

Almost surely, 2^161055403 is an apocalyptic number.

161055403 is a deficient number, since it is larger than the sum of its proper divisors (25445).

161055403 is a wasteful number, since it uses less digits than its factorization.

161055403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25444.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 161055403 is about 12690.7605367054. The cubic root of 161055403 is about 544.0745768487.

The spelling of 161055403 in words is "one hundred sixty-one million, fifty-five thousand, four hundred three".