161349503 has 12 divisors (see below), whose sum is σ = 187982352. Its totient is φ = 138085920.

The previous prime is 161349493. The next prime is 161349511. The reversal of 161349503 is 305943161.

It is a de Polignac number, because none of the positive numbers 2^k-161349503 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 161349503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161343503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35126 + ... + 39452.

It is an arithmetic number, because the mean of its divisors is an integer number (15665196).

Almost surely, 2^161349503 is an apocalyptic number.

161349503 is a deficient number, since it is larger than the sum of its proper divisors (26632849).

161349503 is an equidigital number, since it uses as much as digits as its factorization.

161349503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102 (or 5095 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 161349503 is about 12702.3424217740. The cubic root of 161349503 is about 544.4055499804.

The spelling of 161349503 in words is "one hundred sixty-one million, three hundred forty-nine thousand, five hundred three".