51447975 has 12 divisors (see below), whose sum is σ = 85060776. Its totient is φ = 27438880.

The previous prime is 51447971. The next prime is 51447997. The reversal of 51447975 is 57974415.

It is a happy number.

It is not a de Polignac number, because 51447975 - 2² = 51447971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51447971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 342912 + ... + 343061.

It is an arithmetic number, because the mean of its divisors is an integer number (7088398).

Almost surely, 2^51447975 is an apocalyptic number.

51447975 is a deficient number, since it is larger than the sum of its proper divisors (33612801).

51447975 is a wasteful number, since it uses less digits than its factorization.

51447975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685986 (or 685981 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 51447975 is about 7172.7243778079. The cubic root of 51447975 is about 371.9256195952.

The spelling of 51447975 in words is "fifty-one million, four hundred forty-seven thousand, nine hundred seventy-five".