51520385 has 32 divisors (see below), whose sum is σ = 73751040. Its totient is φ = 33804288.

The previous prime is 51520379. The next prime is 51520411. The reversal of 51520385 is 58302515.

It is not a de Polignac number, because 51520385 - 2⁸ = 51520129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195764 + ... + 196026.

It is an arithmetic number, because the mean of its divisors is an integer number (2304720).

Almost surely, 2^51520385 is an apocalyptic number.

It is an amenable number.

51520385 is a deficient number, since it is larger than the sum of its proper divisors (22230655).

51520385 is a wasteful number, since it uses less digits than its factorization.

51520385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 51520385 is about 7177.7701969344. The cubic root of 51520385 is about 372.1000256130.

The spelling of 51520385 in words is "fifty-one million, five hundred twenty thousand, three hundred eighty-five".