51030215 has 32 divisors (see below), whose sum is σ = 66977280. Its totient is φ = 37217664.

The previous prime is 51030211. The next prime is 51030223. The reversal of 51030215 is 51203015.

51030215 = T₄ + T₅ + ... + T₆₇₃.

It is a cyclic number.

It is not a de Polignac number, because 51030215 - 2² = 51030211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51030193 and 51030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51030211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284996 + ... + 285174.

It is an arithmetic number, because the mean of its divisors is an integer number (2093040).

Almost surely, 2^51030215 is an apocalyptic number.

51030215 is a deficient number, since it is larger than the sum of its proper divisors (15947065).

51030215 is a wasteful number, since it uses less digits than its factorization.

51030215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51030215 is about 7143.5435884440. The cubic root of 51030215 is about 370.9161978970.

The spelling of 51030215 in words is "fifty-one million, thirty thousand, two hundred fifteen".