51028391 has 8 divisors (see below), whose sum is σ = 52526400. Its totient is φ = 49551840.

The previous prime is 51028361. The next prime is 51028403. The reversal of 51028391 is 19382015.

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

It is a cyclic number.

It is not a de Polignac number, because 51028391 - 2¹⁰ = 51027367 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 (51028301) 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, 476 + ... + 10113.

It is an arithmetic number, because the mean of its divisors is an integer number (6565800).

Almost surely, 2^51028391 is an apocalyptic number.

51028391 is a deficient number, since it is larger than the sum of its proper divisors (1498009).

51028391 is a wasteful number, since it uses less digits than its factorization.

51028391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10729.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 51028391 is about 7143.4159195724. The cubic root of 51028391 is about 370.9117785596.

The spelling of 51028391 in words is "fifty-one million, twenty-eight thousand, three hundred ninety-one".