18161002 has 4 divisors (see below), whose sum is σ = 27241506. Its totient is φ = 9080500.

The previous prime is 18160999. The next prime is 18161023. The reversal of 18161002 is 20016181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 5480281 = 3561^2 + 2341^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4540249 + ... + 4540252.

Almost surely, 2^18161002 is an apocalyptic number.

18161002 is a deficient number, since it is larger than the sum of its proper divisors (9080504).

18161002 is an equidigital number, since it uses as much as digits as its factorization.

18161002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9080503.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18161002 is about 4261.5727143861. The cubic root of 18161002 is about 262.8532001333.

Adding to 18161002 its reverse (20016181), we get a palindrome (38177183).

The spelling of 18161002 in words is "eighteen million, one hundred sixty-one thousand, two".