51988471 has 2 divisors, whose sum is σ = 51988472. Its totient is φ = 51988470.

The previous prime is 51988463. The next prime is 51988493. The reversal of 51988471 is 17488915.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51988471 - 2³ = 51988463 is a prime.

It is a super-3 number, since 3×51988471³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51988421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994235 + 25994236.

It is an arithmetic number, because the mean of its divisors is an integer number (25994236).

Almost surely, 2^51988471 is an apocalyptic number.

51988471 is a deficient number, since it is larger than the sum of its proper divisors (1).

51988471 is an equidigital number, since it uses as much as digits as its factorization.

51988471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 51988471 is about 7210.3031142942. The cubic root of 51988471 is about 373.2235289498.

The spelling of 51988471 in words is "fifty-one million, nine hundred eighty-eight thousand, four hundred seventy-one".