51499984 has 10 divisors (see below), whose sum is σ = 99781250. Its totient is φ = 25749984.

The previous prime is 51499963. The next prime is 51499997. The reversal of 51499984 is 48999415.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 1373584 = 7080^2 + 1172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609359 + ... + 1609390.

It is an arithmetic number, because the mean of its divisors is an integer number (9978125).

Almost surely, 2^51499984 is an apocalyptic number.

It is an amenable number.

51499984 is a deficient number, since it is larger than the sum of its proper divisors (48281266).

51499984 is a wasteful number, since it uses less digits than its factorization.

51499984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3218757 (or 3218751 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 51499984 is about 7176.3489324308. The cubic root of 51499984 is about 372.0509045073.

The spelling of 51499984 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred eighty-four".