51042487 has 2 divisors, whose sum is σ = 51042488. Its totient is φ = 51042486.

The previous prime is 51042469. The next prime is 51042491. The reversal of 51042487 is 78424015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51042487 - 2¹⁵ = 51009719 is a prime.

It is a Chen prime.

It is equal to p_3059842 and since 51042487 and 3059842 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51042457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25521243 + 25521244.

It is an arithmetic number, because the mean of its divisors is an integer number (25521244).

Almost surely, 2^51042487 is an apocalyptic number.

51042487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51042487 is an equidigital number, since it uses as much as digits as its factorization.

51042487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 51042487 is about 7144.4024942608. The cubic root of 51042487 is about 370.9459287714.

It can be divided in two parts, 51042 and 487, that added together give a square (51529 = 227²).

The spelling of 51042487 in words is "fifty-one million, forty-two thousand, four hundred eighty-seven".