51216951 has 8 divisors (see below), whose sum is σ = 71883520. Its totient is φ = 32347512.

The previous prime is 51216943. The next prime is 51216953. The reversal of 51216951 is 15961215.

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

It is not a de Polignac number, because 51216951 - 2³ = 51216943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449215 + ... + 449328.

It is an arithmetic number, because the mean of its divisors is an integer number (8985440).

Almost surely, 2^51216951 is an apocalyptic number.

51216951 is a deficient number, since it is larger than the sum of its proper divisors (20666569).

51216951 is a wasteful number, since it uses less digits than its factorization.

51216951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898565.

The product of its digits is 2700, while the sum is 30.

The square root of 51216951 is about 7156.6019171112. The cubic root of 51216951 is about 371.3680811114.

The spelling of 51216951 in words is "fifty-one million, two hundred sixteen thousand, nine hundred fifty-one".