161398303 has 16 divisors (see below), whose sum is σ = 181235232. Its totient is φ = 142480000.

The previous prime is 161398297. The next prime is 161398327. The reversal of 161398303 is 303893161.

161398303 = T₁₇₃₇ + T₁₇₃₈ + ... + T₁₈₃₇.

It is a cyclic number.

It is not a de Polignac number, because 161398303 - 2²⁵ = 127843871 is a prime.

It is a super-2 number, since 2×161398303² = 52098824422559618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161398333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57513 + ... + 60253.

It is an arithmetic number, because the mean of its divisors is an integer number (11327202).

Almost surely, 2^161398303 is an apocalyptic number.

161398303 is a deficient number, since it is larger than the sum of its proper divisors (19836929).

161398303 is a wasteful number, since it uses less digits than its factorization.

161398303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 161398303 is about 12704.2631820976. The cubic root of 161398303 is about 544.4604294241.

It can be divided in two parts, 16139 and 8303, that added together give a palindrome (24442).

The spelling of 161398303 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, three hundred three".