51380487 has 10 divisors (see below), whose sum is σ = 76753688. Its totient is φ = 34253604.

The previous prime is 51380471. The next prime is 51380513. The reversal of 51380487 is 78408315.

It is not a de Polignac number, because 51380487 - 2⁴ = 51380471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51380467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 317083 + ... + 317244.

Almost surely, 2^51380487 is an apocalyptic number.

51380487 is a deficient number, since it is larger than the sum of its proper divisors (25373201).

51380487 is an equidigital number, since it uses as much as digits as its factorization.

51380487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634339 (or 634330 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 51380487 is about 7168.0183454006. The cubic root of 51380487 is about 371.7629212603.

The spelling of 51380487 in words is "fifty-one million, three hundred eighty thousand, four hundred eighty-seven".