51486737 has 4 divisors (see below), whose sum is σ = 51814836. Its totient is φ = 51158640.

The previous prime is 51486671. The next prime is 51486739. The reversal of 51486737 is 73768415.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27290176 + 24196561 = 5224^2 + 4919^2 .

It is a cyclic number.

It is not a de Polignac number, because 51486737 - 2⁸ = 51486481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51486694 and 51486703.

It is not an unprimeable number, because it can be changed into a prime (51486739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163814 + ... + 164127.

It is an arithmetic number, because the mean of its divisors is an integer number (12953709).

Almost surely, 2^51486737 is an apocalyptic number.

It is an amenable number.

51486737 is a deficient number, since it is larger than the sum of its proper divisors (328099).

51486737 is a wasteful number, since it uses less digits than its factorization.

51486737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328098.

The product of its digits is 141120, while the sum is 41.

The square root of 51486737 is about 7175.4259107038. The cubic root of 51486737 is about 372.0190017079.

The spelling of 51486737 in words is "fifty-one million, four hundred eighty-six thousand, seven hundred thirty-seven".