161097498 has 40 divisors (see below), whose sum is σ = 362231892. Its totient is φ = 53512704.

The previous prime is 161097493. The next prime is 161097557. The reversal of 161097498 is 894790161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 159441129 + 1656369 = 12627^2 + 1287^2 .

It is not an unprimeable number, because it can be changed into a prime (161097493) 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 19 ways as a sum of consecutive naturals, for example, 49786 + ... + 52922.

Almost surely, 2^161097498 is an apocalyptic number.

161097498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161097498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181115946).

161097498 is an abundant number, since it is smaller than the sum of its proper divisors (201134394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161097498 is a wasteful number, since it uses less digits than its factorization.

161097498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468 (or 3459 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 161097498 is about 12692.4189183938. The cubic root of 161097498 is about 544.1219742532.

The spelling of 161097498 in words is "one hundred sixty-one million, ninety-seven thousand, four hundred ninety-eight".