51721414 has 4 divisors (see below), whose sum is σ = 77582124. Its totient is φ = 25860706.

The previous prime is 51721409. The next prime is 51721421. The reversal of 51721414 is 41412715.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12930352 + ... + 12930355.

It is an arithmetic number, because the mean of its divisors is an integer number (19395531).

Almost surely, 2^51721414 is an apocalyptic number.

51721414 is a deficient number, since it is larger than the sum of its proper divisors (25860710).

51721414 is a wasteful number, since it uses less digits than its factorization.

51721414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25860709.

The product of its digits is 1120, while the sum is 25.

The square root of 51721414 is about 7191.7601461673. The cubic root of 51721414 is about 372.5833670741.

The spelling of 51721414 in words is "fifty-one million, seven hundred twenty-one thousand, four hundred fourteen".