51722989 has 4 divisors (see below), whose sum is σ = 51739324. Its totient is φ = 51706656.

The previous prime is 51722977. The next prime is 51723029. The reversal of 51722989 is 98922715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98922715 = 5 ⋅19784543.

It can be written as a sum of positive squares in 2 ways, for example, as 10017225 + 41705764 = 3165^2 + 6458^2 .

It is a cyclic number.

It is not a de Polignac number, because 51722989 - 2¹³ = 51714797 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 (51722939) 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, 1722 + ... + 10315.

It is an arithmetic number, because the mean of its divisors is an integer number (12934831).

Almost surely, 2^51722989 is an apocalyptic number.

It is an amenable number.

51722989 is a deficient number, since it is larger than the sum of its proper divisors (16335).

51722989 is a wasteful number, since it uses less digits than its factorization.

51722989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16334.

The product of its digits is 90720, while the sum is 43.

The square root of 51722989 is about 7191.8696456485. The cubic root of 51722989 is about 372.5871489560.

The spelling of 51722989 in words is "fifty-one million, seven hundred twenty-two thousand, nine hundred eighty-nine".