51215984 has 10 divisors (see below), whose sum is σ = 99231000. Its totient is φ = 25607984.

The previous prime is 51215981. The next prime is 51215987. The reversal of 51215984 is 48951215.

It is an interprime number because it is at equal distance from previous prime (51215981) and next prime (51215987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600484 + ... + 1600515.

It is an arithmetic number, because the mean of its divisors is an integer number (9923100).

Almost surely, 2^51215984 is an apocalyptic number.

It is an amenable number.

51215984 is a deficient number, since it is larger than the sum of its proper divisors (48015016).

51215984 is a wasteful number, since it uses less digits than its factorization.

51215984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201007 (or 3201001 counting only the distinct ones).

The product of its digits is 14400, while the sum is 35.

The square root of 51215984 is about 7156.5343567959. The cubic root of 51215984 is about 371.3657438957.

The spelling of 51215984 in words is "fifty-one million, two hundred fifteen thousand, nine hundred eighty-four".