51552399 has 16 divisors (see below), whose sum is σ = 70785792. Its totient is φ = 33354048.

The previous prime is 51552383. The next prime is 51552419. The reversal of 51552399 is 99325515.

It is a Cunningham number, because it is equal to 7180²-1.

It is not a de Polignac number, because 51552399 - 2⁴ = 51552383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51552329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20347 + ... + 22739.

It is an arithmetic number, because the mean of its divisors is an integer number (4424112).

Almost surely, 2^51552399 is an apocalyptic number.

51552399 is a deficient number, since it is larger than the sum of its proper divisors (19233393).

51552399 is a wasteful number, since it uses less digits than its factorization.

51552399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606.

The product of its digits is 60750, while the sum is 39.

The square root of 51552399 is about 7179.9999303621. Note that the first 4 decimals coincide. The cubic root of 51552399 is about 372.1770821261.

The spelling of 51552399 in words is "fifty-one million, five hundred fifty-two thousand, three hundred ninety-nine".