51405487 has 8 divisors (see below), whose sum is σ = 60775200. Its totient is φ = 42542304.

The previous prime is 51405479. The next prime is 51405499. The reversal of 51405487 is 78450415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51405487 - 2³ = 51405479 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 (51405407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126412 + ... + 126817.

It is an arithmetic number, because the mean of its divisors is an integer number (7596900).

Almost surely, 2^51405487 is an apocalyptic number.

51405487 is a deficient number, since it is larger than the sum of its proper divisors (9369713).

51405487 is a wasteful number, since it uses less digits than its factorization.

51405487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253265.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 51405487 is about 7169.7619904708. The cubic root of 51405487 is about 371.8232072209.

The spelling of 51405487 in words is "fifty-one million, four hundred five thousand, four hundred eighty-seven".