51123487 has 2 divisors, whose sum is σ = 51123488. Its totient is φ = 51123486.

The previous prime is 51123463. The next prime is 51123493. The reversal of 51123487 is 78432115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51123487 - 2¹¹ = 51121439 is a prime.

It is a super-2 number, since 2×51123487² = 5227221846078338, 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 (51123407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25561743 + 25561744.

It is an arithmetic number, because the mean of its divisors is an integer number (25561744).

Almost surely, 2^51123487 is an apocalyptic number.

51123487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51123487 is an equidigital number, since it uses as much as digits as its factorization.

51123487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 51123487 is about 7150.0690206459. The cubic root of 51123487 is about 371.1420447407.

The spelling of 51123487 in words is "fifty-one million, one hundred twenty-three thousand, four hundred eighty-seven".