51251289 has 8 divisors (see below), whose sum is σ = 68834400. Its totient is φ = 33917856.

The previous prime is 51251287. The next prime is 51251359. The reversal of 51251289 is 98215215.

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

It is not a de Polignac number, because 51251289 - 2¹ = 51251287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51251287) 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, 61939 + ... + 62760.

It is an arithmetic number, because the mean of its divisors is an integer number (8604300).

Almost surely, 2^51251289 is an apocalyptic number.

It is an amenable number.

51251289 is a deficient number, since it is larger than the sum of its proper divisors (17583111).

51251289 is a wasteful number, since it uses less digits than its factorization.

51251289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124839.

The product of its digits is 7200, while the sum is 33.

The square root of 51251289 is about 7159.0005587372. Note that the first 3 decimals coincide. The cubic root of 51251289 is about 371.4510561691.

The spelling of 51251289 in words is "fifty-one million, two hundred fifty-one thousand, two hundred eighty-nine".