51216903 has 12 divisors (see below), whose sum is σ = 78331968. Its totient is φ = 32136000.

The previous prime is 51216901. The next prime is 51216931. The reversal of 51216903 is 30961215.

It is not a de Polignac number, because 51216903 - 2¹ = 51216901 is a prime.

It is a super-2 number, since 2×51216903² = 5246342305822818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167223 + ... + 167528.

It is an arithmetic number, because the mean of its divisors is an integer number (6527664).

Almost surely, 2^51216903 is an apocalyptic number.

51216903 is a deficient number, since it is larger than the sum of its proper divisors (27115065).

51216903 is a wasteful number, since it uses less digits than its factorization.

51216903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334774 (or 334771 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 51216903 is about 7156.5985635636. The cubic root of 51216903 is about 371.3679650973.

The spelling of 51216903 in words is "fifty-one million, two hundred sixteen thousand, nine hundred three".