161287403 has 8 divisors (see below), whose sum is σ = 165805248. Its totient is φ = 156777984.

The previous prime is 161287397. The next prime is 161287421. The reversal of 161287403 is 304782161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161287403 - 2⁴ = 161287387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161287403.

It is not an unprimeable number, because it can be changed into a prime (161287433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75275 + ... + 77387.

It is an arithmetic number, because the mean of its divisors is an integer number (20725656).

Almost surely, 2^161287403 is an apocalyptic number.

161287403 is a deficient number, since it is larger than the sum of its proper divisors (4517845).

161287403 is a wasteful number, since it uses less digits than its factorization.

161287403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 161287403 is about 12699.8977554939. The cubic root of 161287403 is about 544.3356976366.

The spelling of 161287403 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, four hundred three".