18291316 has 6 divisors (see below), whose sum is σ = 32009810. Its totient is φ = 9145656.

The previous prime is 18291313. The next prime is 18291347. The reversal of 18291316 is 61319281.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 4822416 = 3670^2 + 2196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18291311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2286411 + ... + 2286418.

Almost surely, 2^18291316 is an apocalyptic number.

It is an amenable number.

18291316 is a deficient number, since it is larger than the sum of its proper divisors (13718494).

18291316 is a wasteful number, since it uses less digits than its factorization.

18291316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572833 (or 4572831 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 18291316 is about 4276.8348109320. The cubic root of 18291316 is about 263.4804021013.

The spelling of 18291316 in words is "eighteen million, two hundred ninety-one thousand, three hundred sixteen".