51722647 has 4 divisors (see below), whose sum is σ = 52698600. Its totient is φ = 50746696.

The previous prime is 51722639. The next prime is 51722677. The reversal of 51722647 is 74622715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74622715 = 5 ⋅14924543.

It is a cyclic number.

It is not a de Polignac number, because 51722647 - 2³ = 51722639 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 (51722677) 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, 487897 + ... + 488002.

It is an arithmetic number, because the mean of its divisors is an integer number (13174650).

Almost surely, 2^51722647 is an apocalyptic number.

51722647 is a deficient number, since it is larger than the sum of its proper divisors (975953).

51722647 is an equidigital number, since it uses as much as digits as its factorization.

51722647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975952.

The product of its digits is 23520, while the sum is 34.

The square root of 51722647 is about 7191.8458687600. The cubic root of 51722647 is about 372.5863277539.

The spelling of 51722647 in words is "fifty-one million, seven hundred twenty-two thousand, six hundred forty-seven".