51101866 has 4 divisors (see below), whose sum is σ = 76652802. Its totient is φ = 25550932.

The previous prime is 51101863. The next prime is 51101891. The reversal of 51101866 is 66810115.

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., 34869025 + 16232841 = 5905^2 + 4029^2 .

It is a super-2 number, since 2×51101866² = 5222801417363912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51101863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775465 + ... + 12775468.

Almost surely, 2^51101866 is an apocalyptic number.

51101866 is a deficient number, since it is larger than the sum of its proper divisors (25550936).

51101866 is a wasteful number, since it uses less digits than its factorization.

51101866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25550935.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 51101866 is about 7148.5569173086. The cubic root of 51101866 is about 371.0897165832.

The spelling of 51101866 in words is "fifty-one million, one hundred one thousand, eight hundred sixty-six".