51536389 has 4 divisors (see below), whose sum is σ = 51701356. Its totient is φ = 51371424.

The previous prime is 51536383. The next prime is 51536413. The reversal of 51536389 is 98363515.

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 12723489 + 38812900 = 3567^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 51536389 - 2⁵ = 51536357 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 (51536383) 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, 82014 + ... + 82639.

It is an arithmetic number, because the mean of its divisors is an integer number (12925339).

Almost surely, 2^51536389 is an apocalyptic number.

It is an amenable number.

51536389 is a deficient number, since it is larger than the sum of its proper divisors (164967).

51536389 is a wasteful number, since it uses less digits than its factorization.

51536389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164966.

The product of its digits is 97200, while the sum is 40.

The square root of 51536389 is about 7178.8849412705. The cubic root of 51536389 is about 372.1385506376.

The spelling of 51536389 in words is "fifty-one million, five hundred thirty-six thousand, three hundred eighty-nine".