51989506 has 4 divisors (see below), whose sum is σ = 77984262. Its totient is φ = 25994752.

The previous prime is 51989503. The next prime is 51989513. The reversal of 51989506 is 60598915.

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 only one way, i.e., 35105625 + 16883881 = 5925^2 + 4109^2 .

It is not an unprimeable number, because it can be changed into a prime (51989503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12997375 + ... + 12997378.

Almost surely, 2^51989506 is an apocalyptic number.

51989506 is a deficient number, since it is larger than the sum of its proper divisors (25994756).

51989506 is a wasteful number, since it uses less digits than its factorization.

51989506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25994755.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 51989506 is about 7210.3748862316. The cubic root of 51989506 is about 373.2260056771.

The spelling of 51989506 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred six".