51989057 has 4 divisors (see below), whose sum is σ = 52212420. Its totient is φ = 51765696.

The previous prime is 51989029. The next prime is 51989059. The reversal of 51989057 is 75098915.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 47761921 = 2056^2 + 6911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51989057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51988999 and 51989017.

It is not an unprimeable number, because it can be changed into a prime (51989059) 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, 111332 + ... + 111797.

It is an arithmetic number, because the mean of its divisors is an integer number (13053105).

Almost surely, 2^51989057 is an apocalyptic number.

It is an amenable number.

51989057 is a deficient number, since it is larger than the sum of its proper divisors (223363).

51989057 is a wasteful number, since it uses less digits than its factorization.

51989057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223362.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 51989057 is about 7210.3437504740. The cubic root of 51989057 is about 373.2249312362.

The spelling of 51989057 in words is "fifty-one million, nine hundred eighty-nine thousand, fifty-seven".