51206697 has 12 divisors (see below), whose sum is σ = 74698884. Its totient is φ = 33799200.

The previous prime is 51206629. The next prime is 51206707. The reversal of 51206697 is 79660215.

It can be written as a sum of positive squares in 2 ways, for example, as 23707161 + 27499536 = 4869^2 + 5244^2 .

It is not a de Polignac number, because 51206697 - 2⁷ = 51206569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51206797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27258 + ... + 29075.

It is an arithmetic number, because the mean of its divisors is an integer number (6224907).

Almost surely, 2^51206697 is an apocalyptic number.

It is an amenable number.

51206697 is a deficient number, since it is larger than the sum of its proper divisors (23492187).

51206697 is a wasteful number, since it uses less digits than its factorization.

51206697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56440 (or 56437 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 51206697 is about 7155.8854797991. The cubic root of 51206697 is about 371.3432959417.

The spelling of 51206697 in words is "fifty-one million, two hundred six thousand, six hundred ninety-seven".