51489623 has 2 divisors, whose sum is σ = 51489624. Its totient is φ = 51489622.

The previous prime is 51489539. The next prime is 51489629. The reversal of 51489623 is 32698415.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51489623 - 2¹⁸ = 51227479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51489629) 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, 25744811 + 25744812.

It is an arithmetic number, because the mean of its divisors is an integer number (25744812).

Almost surely, 2^51489623 is an apocalyptic number.

51489623 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489623 is an equidigital number, since it uses as much as digits as its factorization.

51489623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 51489623 is about 7175.6270109308. The cubic root of 51489623 is about 372.0259525386.

The spelling of 51489623 in words is "fifty-one million, four hundred eighty-nine thousand, six hundred twenty-three".