51289287 has 16 divisors (see below), whose sum is σ = 81553920. Its totient is φ = 28033632.

The previous prime is 51289243. The next prime is 51289297. The reversal of 51289287 is 78298215.

It is not a de Polignac number, because 51289287 - 2⁶ = 51289223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51289297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52612 + ... + 53577.

It is an arithmetic number, because the mean of its divisors is an integer number (5097120).

Almost surely, 2^51289287 is an apocalyptic number.

51289287 is a deficient number, since it is larger than the sum of its proper divisors (30264633).

51289287 is a wasteful number, since it uses less digits than its factorization.

51289287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106222.

The product of its digits is 80640, while the sum is 42.

The square root of 51289287 is about 7161.6539290865. The cubic root of 51289287 is about 371.5428321405.

The spelling of 51289287 in words is "fifty-one million, two hundred eighty-nine thousand, two hundred eighty-seven".