51520047 has 16 divisors (see below), whose sum is σ = 75082752. Its totient is φ = 31282560.

The previous prime is 51520043. The next prime is 51520093. The reversal of 51520047 is 74002515.

It is not a de Polignac number, because 51520047 - 2² = 51520043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51519999 and 51520026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14713 + ... + 17874.

It is an arithmetic number, because the mean of its divisors is an integer number (4692672).

Almost surely, 2^51520047 is an apocalyptic number.

51520047 is a deficient number, since it is larger than the sum of its proper divisors (23562705).

51520047 is a wasteful number, since it uses less digits than its factorization.

51520047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32638.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51520047 is about 7177.7466519793. The cubic root of 51520047 is about 372.0992118892.

The spelling of 51520047 in words is "fifty-one million, five hundred twenty thousand, forty-seven".