51027491 has 4 divisors (see below), whose sum is σ = 51050184. Its totient is φ = 51004800.

The previous prime is 51027481. The next prime is 51027497. The reversal of 51027491 is 19472015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51027491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51027497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7550 + ... + 12611.

It is an arithmetic number, because the mean of its divisors is an integer number (12762546).

Almost surely, 2^51027491 is an apocalyptic number.

51027491 is a deficient number, since it is larger than the sum of its proper divisors (22693).

51027491 is a wasteful number, since it uses less digits than its factorization.

51027491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22692.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 51027491 is about 7143.3529242226. The cubic root of 51027491 is about 370.9095979268.

The spelling of 51027491 in words is "fifty-one million, twenty-seven thousand, four hundred ninety-one".