51881389 has 8 divisors (see below), whose sum is σ = 59649408. Its totient is φ = 44202480.

The previous prime is 51881387. The next prime is 51881413. The reversal of 51881389 is 98318815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51881389 - 2¹ = 51881387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51881387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21022 + ... + 23359.

It is an arithmetic number, because the mean of its divisors is an integer number (7456176).

Almost surely, 2^51881389 is an apocalyptic number.

It is an amenable number.

51881389 is a deficient number, since it is larger than the sum of its proper divisors (7768019).

51881389 is a wasteful number, since it uses less digits than its factorization.

51881389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44555.

The product of its digits is 69120, while the sum is 43.

The square root of 51881389 is about 7202.8736626433. The cubic root of 51881389 is about 372.9671067602.

The spelling of 51881389 in words is "fifty-one million, eight hundred eighty-one thousand, three hundred eighty-nine".