51493649 has 2 divisors, whose sum is σ = 51493650. Its totient is φ = 51493648.

The previous prime is 51493639. The next prime is 51493681. The reversal of 51493649 is 94639415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48052624 + 3441025 = 6932^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 51493649 - 2²⁴ = 34716433 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51493609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25746824 + 25746825.

It is an arithmetic number, because the mean of its divisors is an integer number (25746825).

Almost surely, 2^51493649 is an apocalyptic number.

It is an amenable number.

51493649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51493649 is an equidigital number, since it uses as much as digits as its factorization.

51493649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 51493649 is about 7175.9075384233. The cubic root of 51493649 is about 372.0356485859.

The spelling of 51493649 in words is "fifty-one million, four hundred ninety-three thousand, six hundred forty-nine".