51630361 has 2 divisors, whose sum is σ = 51630362. Its totient is φ = 51630360.

The previous prime is 51630347. The next prime is 51630367. The reversal of 51630361 is 16303615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47403225 + 4227136 = 6885^2 + 2056^2 .

It is a cyclic number.

It is not a de Polignac number, because 51630361 - 2⁵ = 51630329 is a prime.

It is not a weakly prime, because it can be changed into another prime (51630367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25815180 + 25815181.

It is an arithmetic number, because the mean of its divisors is an integer number (25815181).

Almost surely, 2^51630361 is an apocalyptic number.

It is an amenable number.

51630361 is a deficient number, since it is larger than the sum of its proper divisors (1).

51630361 is an equidigital number, since it uses as much as digits as its factorization.

51630361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 51630361 is about 7185.4269880084. The cubic root of 51630361 is about 372.3646004301.

Adding to 51630361 its reverse (16303615), we get a palindrome (67933976).

The spelling of 51630361 in words is "fifty-one million, six hundred thirty thousand, three hundred sixty-one".