51896986 has 4 divisors (see below), whose sum is σ = 77845482. Its totient is φ = 25948492.

The previous prime is 51896981. The next prime is 51896987. The reversal of 51896986 is 68969815.

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., 30041361 + 21855625 = 5481^2 + 4675^2 .

It is not an unprimeable number, because it can be changed into a prime (51896981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12974245 + ... + 12974248.

Almost surely, 2^51896986 is an apocalyptic number.

51896986 is a deficient number, since it is larger than the sum of its proper divisors (25948496).

51896986 is a wasteful number, since it uses less digits than its factorization.

51896986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25948495.

The product of its digits is 933120, while the sum is 52.

The square root of 51896986 is about 7203.9562741594. The cubic root of 51896986 is about 373.0044778049.

The spelling of 51896986 in words is "fifty-one million, eight hundred ninety-six thousand, nine hundred eighty-six".