51818002 has 4 divisors (see below), whose sum is σ = 77727006. Its totient is φ = 25909000.

The previous prime is 51817999. The next prime is 51818003. The reversal of 51818002 is 20081815.

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., 32729841 + 19088161 = 5721^2 + 4369^2 .

It is not an unprimeable number, because it can be changed into a prime (51818003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12954499 + ... + 12954502.

Almost surely, 2^51818002 is an apocalyptic number.

51818002 is a deficient number, since it is larger than the sum of its proper divisors (25909004).

51818002 is a wasteful number, since it uses less digits than its factorization.

51818002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25909003.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 51818002 is about 7198.4721990156. The cubic root of 51818002 is about 372.8151518168.

Adding to 51818002 its reverse (20081815), we get a palindrome (71899817).

The spelling of 51818002 in words is "fifty-one million, eight hundred eighteen thousand, two".