161503207 has 4 divisors (see below), whose sum is σ = 161585296. Its totient is φ = 161421120.

The previous prime is 161503201. The next prime is 161503241. The reversal of 161503207 is 702305161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161503207 - 2¹⁹ = 160978919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161503201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38019 + ... + 42052.

It is an arithmetic number, because the mean of its divisors is an integer number (40396324).

Almost surely, 2^161503207 is an apocalyptic number.

161503207 is a deficient number, since it is larger than the sum of its proper divisors (82089).

161503207 is an equidigital number, since it uses as much as digits as its factorization.

161503207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82088.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 161503207 is about 12708.3912042398. The cubic root of 161503207 is about 544.5783647962.

Adding to 161503207 its reverse (702305161), we get a palindrome (863808368).

The spelling of 161503207 in words is "one hundred sixty-one million, five hundred three thousand, two hundred seven".