51645049 has 2 divisors, whose sum is σ = 51645050. Its totient is φ = 51645048.

The previous prime is 51645029. The next prime is 51645053. The reversal of 51645049 is 94054615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45319824 + 6325225 = 6732^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 51645049 - 2¹³ = 51636857 is a prime.

It is a super-2 number, since 2×51645049² = 5334422172424802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51645019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822524 + 25822525.

It is an arithmetic number, because the mean of its divisors is an integer number (25822525).

Almost surely, 2^51645049 is an apocalyptic number.

It is an amenable number.

51645049 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645049 is an equidigital number, since it uses as much as digits as its factorization.

51645049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 51645049 is about 7186.4489840254. The cubic root of 51645049 is about 372.3999076446.

The spelling of 51645049 in words is "fifty-one million, six hundred forty-five thousand, forty-nine".