51488581 has 2 divisors, whose sum is σ = 51488582. Its totient is φ = 51488580.

The previous prime is 51488539. The next prime is 51488609. The reversal of 51488581 is 18588415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43020481 + 8468100 = 6559^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 51488581 - 2¹³ = 51480389 is a prime.

It is a super-2 number, since 2×51488581² = 5302147946787122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51488681) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25744290 + 25744291.

It is an arithmetic number, because the mean of its divisors is an integer number (25744291).

Almost surely, 2^51488581 is an apocalyptic number.

It is an amenable number.

51488581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51488581 is an equidigital number, since it uses as much as digits as its factorization.

51488581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51200, while the sum is 40.

The square root of 51488581 is about 7175.5544036681. The cubic root of 51488581 is about 372.0234429478.

The spelling of 51488581 in words is "fifty-one million, four hundred eighty-eight thousand, five hundred eighty-one".