51204866 has 4 divisors (see below), whose sum is σ = 76807302. Its totient is φ = 25602432.

The previous prime is 51204863. The next prime is 51204869. The reversal of 51204866 is 66840215.

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

It is an interprime number because it is at equal distance from previous prime (51204863) and next prime (51204869).

It can be written as a sum of positive squares in only one way, i.e., 36954241 + 14250625 = 6079^2 + 3775^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51204863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12801215 + ... + 12801218.

Almost surely, 2^51204866 is an apocalyptic number.

51204866 is a deficient number, since it is larger than the sum of its proper divisors (25602436).

51204866 is a wasteful number, since it uses less digits than its factorization.

51204866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25602435.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 51204866 is about 7155.7575420077. The cubic root of 51204866 is about 371.3388698431.

The spelling of 51204866 in words is "fifty-one million, two hundred four thousand, eight hundred sixty-six".