51351515 has 4 divisors (see below), whose sum is σ = 61621824. Its totient is φ = 41081208.

The previous prime is 51351499. The next prime is 51351527. The reversal of 51351515 is 51515315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51351515 - 2⁴ = 51351499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5135147 + ... + 5135156.

It is an arithmetic number, because the mean of its divisors is an integer number (15405456).

Almost surely, 2^51351515 is an apocalyptic number.

51351515 is a deficient number, since it is larger than the sum of its proper divisors (10270309).

51351515 is a wasteful number, since it uses less digits than its factorization.

51351515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270308.

The product of its digits is 1875, while the sum is 26.

The square root of 51351515 is about 7165.9971392682. The cubic root of 51351515 is about 371.6930325986.

The spelling of 51351515 in words is "fifty-one million, three hundred fifty-one thousand, five hundred fifteen".