161513998 has 4 divisors (see below), whose sum is σ = 242271000. Its totient is φ = 80756998.

The previous prime is 161513983. The next prime is 161514007. The reversal of 161513998 is 899315161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899315161 = 13693 ⋅65677.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40378498 + ... + 40378501.

It is an arithmetic number, because the mean of its divisors is an integer number (60567750).

Almost surely, 2^161513998 is an apocalyptic number.

161513998 is a deficient number, since it is larger than the sum of its proper divisors (80757002).

161513998 is an equidigital number, since it uses as much as digits as its factorization.

161513998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80757001.

The product of its digits is 58320, while the sum is 43.

The square root of 161513998 is about 12708.8157591492. The cubic root of 161513998 is about 544.5904933774.

The spelling of 161513998 in words is "one hundred sixty-one million, five hundred thirteen thousand, nine hundred ninety-eight".