51681395 has 8 divisors (see below), whose sum is σ = 62434800. Its totient is φ = 41067040.

The previous prime is 51681379. The next prime is 51681401. The reversal of 51681395 is 59318615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51681395 - 2⁴ = 51681379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33941 + ... + 35430.

It is an arithmetic number, because the mean of its divisors is an integer number (7804350).

Almost surely, 2^51681395 is an apocalyptic number.

51681395 is a deficient number, since it is larger than the sum of its proper divisors (10753405).

51681395 is a wasteful number, since it uses less digits than its factorization.

51681395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69525.

The product of its digits is 32400, while the sum is 38.

The square root of 51681395 is about 7188.9773264352. The cubic root of 51681395 is about 372.4872478856.

The spelling of 51681395 in words is "fifty-one million, six hundred eighty-one thousand, three hundred ninety-five".