51350491 has 4 divisors (see below), whose sum is σ = 52602984. Its totient is φ = 50098000.

The previous prime is 51350459. The next prime is 51350527. The reversal of 51350491 is 19405315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19405315 = 5 ⋅3881063.

It is a cyclic number.

It is not a de Polignac number, because 51350491 - 2⁵ = 51350459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51350401) 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, 626185 + ... + 626266.

It is an arithmetic number, because the mean of its divisors is an integer number (13150746).

Almost surely, 2^51350491 is an apocalyptic number.

51350491 is a deficient number, since it is larger than the sum of its proper divisors (1252493).

51350491 is a wasteful number, since it uses less digits than its factorization.

51350491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252492.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51350491 is about 7165.9256903766. The cubic root of 51350491 is about 371.6905619400.

The spelling of 51350491 in words is "fifty-one million, three hundred fifty thousand, four hundred ninety-one".