161501498 has 4 divisors (see below), whose sum is σ = 242252250. Its totient is φ = 80750748.

The previous prime is 161501453. The next prime is 161501503. The reversal of 161501498 is 894105161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 894105161 = 107 ⋅8356123.

It can be written as a sum of positive squares in only one way, i.e., 101949409 + 59552089 = 10097^2 + 7717^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40375373 + ... + 40375376.

Almost surely, 2^161501498 is an apocalyptic number.

161501498 is a deficient number, since it is larger than the sum of its proper divisors (80750752).

161501498 is an equidigital number, since it uses as much as digits as its factorization.

161501498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80750751.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161501498 is about 12708.3239650239. The cubic root of 161501498 is about 544.5764439103.

The spelling of 161501498 in words is "one hundred sixty-one million, five hundred one thousand, four hundred ninety-eight".