51255215 has 8 divisors (see below), whose sum is σ = 67097808. Its totient is φ = 37276480.

The previous prime is 51255173. The next prime is 51255227.

51255215 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 51255215 - 2¹² = 51251119 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 465902 + ... + 466011.

It is an arithmetic number, because the mean of its divisors is an integer number (8387226).

Almost surely, 2^51255215 is an apocalyptic number.

51255215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51255215 is a deficient number, since it is larger than the sum of its proper divisors (15842593).

51255215 is a wasteful number, since it uses less digits than its factorization.

51255215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931929.

The product of its digits is 2500, while the sum is 26.

The square root of 51255215 is about 7159.2747537722. The cubic root of 51255215 is about 371.4605406760.

The spelling of 51255215 in words is "fifty-one million, two hundred fifty-five thousand, two hundred fifteen".